Squashed commit of the following:

commit 333249f
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Thu Dec 5 17:36:58 2019 -0500

    Preparing for publish.

commit 0aa32c5
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Dec 4 15:19:37 2019 -0800

    Adding Guss.

commit 6ba1f70
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Dec 4 09:12:26 2019 -0800

    Fixing type error in jelly component.

commit a522dff
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Sun Dec 1 17:31:28 2019 -0800

    Fixing effect on self.

commit 2375f0c
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 27 18:03:08 2019 -0800

    Adding animation for effects.

commit dee0d83
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Nov 26 16:40:01 2019 -0800

    Getting drop shadow, blur, and inner shadows working.

commit 31aa641
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Nov 25 19:57:39 2019 -0800

    Major groundwork for effects & masking.

commit 9ff2b94
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 20 16:38:28 2019 -0800

    Fixing gradient transformations for shapes with transformAffectsStroke set to true.

commit 1e88ddf
Merge: c7758eb 17f73ec
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Nov 18 16:32:28 2019 -0800

    Merge branch 'master' of https://github.com/2d-inc/Flare-Flutter

commit c7758eb
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Nov 18 16:32:23 2019 -0800

    Fixing FlareControls.

commit 17f73ec
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Fri Nov 15 11:09:51 2019 +0000

    Update README with latest version

commit c9f4341
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Thu Nov 7 15:05:04 2019 -0800

    Backing out changeImageFromNetwork. Issue #183

commit e9712a4
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Thu Nov 7 12:32:17 2019 -0800

    Bumping versions.

commit 366cdc0
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Thu Nov 7 12:27:53 2019 -0800

    Adding support for runtime image swapping, requires marking image nodes as isDynamic in Flare. Issue #183.

commit 53a7c65
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 6 17:30:42 2019 -0800

    Updating flare_flutter version.

commit b391dd4
Merge: 1e9b22e 9ec074b
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 6 17:28:34 2019 -0800

    Merge branch 'warmth_fix'

commit 9ec074b
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 6 15:43:31 2019 -0800

    Call setState if mounted.

commit c66ac64
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Nov 6 15:38:06 2019 -0800

    Addressing an issue found in #177 with FlareCacheBuilder setting state when widget is no longer mounted.

commit 1e9b22e
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Wed Nov 6 19:02:25 2019 +0100

    Init mat before inverting

commit bc07b87
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Wed Nov 6 19:00:13 2019 +0100

    Remove local flare_dart from examples pubspec #184

commit e1cca7c
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 29 12:50:30 2019 -0700

    Bumping versions, merging optimal_load branch, and persisting settings in checkbox example.

commit 55cae39
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 29 12:41:43 2019 -0700

    Copy transform affects stroke properly when instancing shapes.

commit 43716dd
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Oct 28 12:52:09 2019 -0700

    Prevent coldLoad (async) from happening when widget isn’t ready to load.

commit 506837e
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 25 13:00:56 2019 -0700

    Improving loading.

commit 9ee95b9
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 25 10:42:42 2019 -0700

    Make sure overrideColor is set even when drawableNodes is null.

commit 7d59de1
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Fri Oct 25 13:15:34 2019 +0100

    Move null check

commit 528af53
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Fri Oct 25 13:10:17 2019 +0100

    Insert null checks for artboards with no drawables #178

commit 33f23a7
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Fri Oct 25 12:16:16 2019 +0100

    Remove GradientColor override of ActorPaint opacity getter #179

commit 59ba2f0
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Thu Oct 24 09:31:41 2019 +0100

    Document the `actor_animatino.apply()` function

commit d77438f
Author: Umberto Sonnino <rimher@gmail.com>
Date:   Thu Oct 24 09:31:10 2019 +0100

    Fix division by 0 on transform constraint

commit f0cf988
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 11 12:59:13 2019 -0700

    Fix reading of JSON clip values. Issue #172

commit a7796e0
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 11 12:39:48 2019 -0700

    Mitigating issue #172.

commit 373c14a
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Oct 9 14:21:47 2019 -0700

    Fixing issue with image clipping.

commit ae1c901
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Oct 9 11:19:16 2019 -0700

    Fix merge bugs.

commit d8cb780
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Wed Oct 9 11:09:42 2019 -0700

    Adding support for difference clipping.

commit bf99a76
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 19:07:26 2019 -0700

    Matching stable version

commit 9becc74
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 13:58:11 2019 -0700

    Bumping flare_dart to 2.0 due to breaking changes.

commit 0a292cc
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 13:39:57 2019 -0700

    Bumping versions and changelogs.

commit 431a98e
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 13:35:26 2019 -0700

    Fixing up analysis issues for #169

commit 72fb6fc
Merge: 4d00202 dc68dea
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 13:02:17 2019 -0700

    Merge branch 'master' of https://github.com/2d-inc/Flare-Flutter

commit 4d00202
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Tue Oct 8 13:02:11 2019 -0700

    Cleaning up analysis issues.

commit dc68dea
Merge: 5ca8d49 f1d9749
Author: Luigi Rosso <luigi-rosso@users.noreply.github.com>
Date:   Tue Oct 8 11:06:53 2019 -0700

    Merge pull request #168 from mehmetf/master

    Escalate the severity of unused imports in analyzer

commit f1d9749
Author: Mehmet Fidanboylu <mehmetf@google.com>
Date:   Tue Oct 8 10:20:58 2019 -0700

    Do the same changes to flare_dart

commit 64f395e
Author: Mehmet Fidanboylu <mehmetf@google.com>
Date:   Tue Oct 8 10:17:51 2019 -0700

    Escalate the severity of unused imports in analyzer

commit 5ca8d49
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Oct 7 11:22:38 2019 -0700

    Bumping versions and changelog.

commit 874ce8e
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Oct 7 11:20:28 2019 -0700

    Adding support for nodes inside of shapes.

commit 4d06431
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 4 18:06:09 2019 -0700

    Introducing FlareTesting.setup();

commit 2c5f420
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Fri Oct 4 13:44:25 2019 -0700

    Clamping trim start/end.

commit daba34d
Author: Luigi Rosso <luigi.rosso@gmail.com>
Date:   Mon Sep 30 21:21:55 2019 +0200

    Cherry picking critical lints from #1 63 and updating for pub.

example/guss/.gitignore

@@ -0,0 +1,71 @@
+# Miscellaneous
+*.class
+*.lock
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Visual Studio Code related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

example/guss/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: faae8bde78ac273ae380cd8a6d18b093534ec58c
+  channel: master
+
+project_type: app

example/guss/README.md

@@ -0,0 +1,41 @@
+# Teddy
+
+<img align="right" src="https://i.imgur.com/hJU9Obt.gif" height="250">
+
+An example built using [JCToon's](https://www.2dimensions.com/a/JuanCarlos/files/flare/teddy/preview) Flare File as a custom UI component. <br/>
+Teddy will follow the cursor as you type or move it around.
+
+## Overview
+
+The basic idea is to use the `ctrl_face` node in JCToon's file to change the direction of Teddy's gaze, as it's shown here in the gif to the right.
+
+This is done by using [custom `FlareControls`](lib/teddy_controller.dart), available in `/lib/teddy_controller.dart`.
+
+`FlareControls` is a custom implementation of the `FlareController` interface. <br/>The interface and can be found in [flare_actor.dart](../../lib/flare_actor.dart#L13-L17) and it has three methods:
+
+```
+abstract class FlareController {
+  void initialize(FlutterActorArtboard artboard);
+  void setViewTransform(Mat2D viewTransform);
+  bool advance(FlutterActorArtboard artboard, double elapsed);
+}
+```
+
+<img align="right" src="https://i.imgur.com/WdjurVo.gif" width="300" />
+
+An instance of `TeddyController` is passed to the `FlareActor` in [`/lib/main.dart`](lib/main.dart#L77). This ties the controller to this widget, and allows it to use the three overrides to perform custom actions:
+
+```
+FlareActor(
+    "assets/Teddy.flr",
+    controller: _teddyController,
+    [...]
+)
+```
+
+In this example, `initialize()` will grab the reference to the `ctrl_face` node through the library call `artboard.getNode("ctrl_face")`. 
+
+Moreover, by [extending `FlareControls`](../../lib/flare_actor.dart#L462), `TeddyController` can take advantage of a concrete implementation of this interface:
+- `play(String animationName)`
+- `advance(double elapsed)` - a base implementation which advances and mixes multiple animations
+

example/guss/analysis_options.yaml

@@ -0,0 +1,122 @@
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+  errors:
+    unused_import: error
+
+linter:
+  rules:
+  - always_put_required_named_parameters_first
+  - always_require_non_null_named_parameters
+  - annotate_overrides
+  - avoid_annotating_with_dynamic
+  - avoid_bool_literals_in_conditional_expressions
+  - avoid_catches_without_on_clauses
+  - avoid_catching_errors
+  - avoid_classes_with_only_static_members
+  - avoid_double_and_int_checks
+  - avoid_empty_else
+  - avoid_field_initializers_in_const_classes
+  - avoid_implementing_value_types
+  - avoid_init_to_null
+  - avoid_js_rounded_ints
+  - avoid_null_checks_in_equality_operators
+  - avoid_relative_lib_imports
+  - avoid_return_types_on_setters
+  - avoid_returning_null
+  - avoid_returning_null_for_future
+  - avoid_returning_null_for_void
+  - avoid_returning_this
+  - avoid_setters_without_getters
+  - avoid_shadowing_type_parameters
+  - avoid_single_cascade_in_expression_statements
+  - avoid_slow_async_io
+  - avoid_types_as_parameter_names
+  - avoid_unused_constructor_parameters
+  - avoid_void_async
+  - await_only_futures
+  - camel_case_types
+  - cancel_subscriptions
+  - close_sinks
+  - constant_identifier_names
+  - control_flow_in_finally
+  - curly_braces_in_flow_control_structures
+  - directives_ordering
+  - empty_catches
+  - empty_constructor_bodies
+  - empty_statements
+  - file_names
+  - hash_and_equals
+  - implementation_imports
+  - invariant_booleans
+  - iterable_contains_unrelated_type
+  - join_return_with_assignment
+  - library_names
+  - library_prefixes
+  - lines_longer_than_80_chars
+  - list_remove_unrelated_type
+  - literal_only_boolean_expressions
+  - no_adjacent_strings_in_list
+  - no_duplicate_case_values
+  - non_constant_identifier_names
+  - null_closures
+  - one_member_abstracts
+  - only_throw_errors
+  - overridden_fields
+  - package_api_docs
+  - package_names
+  - package_prefixed_library_names
+  - parameter_assignments
+  - prefer_adjacent_string_concatenation
+  - prefer_asserts_in_initializer_lists
+  - prefer_collection_literals
+  - prefer_conditional_assignment
+  - prefer_const_constructors
+  - prefer_const_constructors_in_immutables
+  - prefer_const_declarations
+  - prefer_const_literals_to_create_immutables
+  - prefer_constructors_over_static_methods
+  - prefer_contains
+  - prefer_equal_for_default_values
+  - prefer_final_fields
+  - prefer_final_in_for_each
+  - prefer_foreach
+  - prefer_function_declarations_over_variables
+  - prefer_initializing_formals
+  - prefer_is_empty
+  - prefer_is_not_empty
+  - prefer_iterable_whereType
+  # - prefer_mixin
+  - prefer_null_aware_operators
+  - prefer_typing_uninitialized_variables
+  - prefer_void_to_null
+  - recursive_getters
+  - slash_for_doc_comments
+  - sort_pub_dependencies
+  - sort_unnamed_constructors_first
+  - test_types_in_equals
+  - throw_in_finally
+  - type_annotate_public_apis
+  - type_init_formals
+  - unawaited_futures
+  - unnecessary_await_in_return
+  - unnecessary_brace_in_string_interps
+  - unnecessary_const
+  - unnecessary_getters_setters
+  - unnecessary_lambdas
+  - unnecessary_new
+  - unnecessary_null_aware_assignments
+  - unnecessary_null_in_if_null_operators
+  - unnecessary_overrides
+  - unnecessary_parenthesis
+  - unnecessary_statements
+  - unnecessary_this
+  - unrelated_type_equality_checks
+  - use_full_hex_values_for_flutter_colors
+  - use_rethrow_when_possible
+  - use_setters_to_change_properties
+  - use_string_buffers
+  - use_to_and_as_if_applicable
+  - valid_regexps
+  - void_checks

example/guss/android/app/build.gradle

@@ -0,0 +1,61 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 28
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.teddy"
+        minSdkVersion 16
+        targetSdkVersion 27
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

example/guss/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,39 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.teddy">
+
+    <!-- The INTERNET permission is required for development. Specifically,
+         flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="teddy"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- This keeps the window background of the activity showing
+                 until Flutter renders its first frame. It can be removed if
+                 there is no splash screen (such as the default splash screen
+                 defined in @style/LaunchTheme). -->
+            <meta-data
+                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
+                android:value="true" />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

example/guss/android/app/src/main/java/com/example/teddy/MainActivity.java

@@ -0,0 +1,13 @@
+package com.example.teddy;
+
+import android.os.Bundle;
+import io.flutter.app.FlutterActivity;
+import io.flutter.plugins.GeneratedPluginRegistrant;
+
+public class MainActivity extends FlutterActivity {
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    GeneratedPluginRegistrant.registerWith(this);
+  }
+}

example/guss/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/guss/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+</resources>