Apply new features, improvements and bug fixes from flixel-community

[WingEraser]

Flixel v2.56

This version fixes many of Flixel's older bugs, while staying reverse compatible with projects that use Flixel v2.55 (the current version in AdamAtomic/flixel).

New Features

Add properties numFrames and maxFrames to FlxSprite (#174)
Add new FlxTween class (#114)
PLACEHOLDER Add function to trigger full-screen support (not complete) (#74)
Make FlxG.log() able to split out arrays using FlxU.formatArray() (#74)
Add optional ColorMap parameter to FlxTilemap.bitmapToCSV() (#74)

Improvements

Prevent being able to set a FlxSprite to an invalid frame (#174)
Prevent errors if destroy() is called twice (#153)
INVALID Log error if invalid Bitmap passed to FlxG.addBitmap() (#127)
NO FIX FlxG.sort() won't crash if a property is not found (#116)
Log error if invalid custom particle class is passed to FlxEmitter (#95)
Prevent being able to pass null to FlxObject.add() (#87)
FlxObjects will now stop when they reach the end of a path (#)
INVALID Remove several FlashBuilder/FDT warnings Remove migration warnings if published with Flash IDE (#76)
Add super.destroy() to all overridden destroy() methods (#73)
INVALID Add http:// prefix if user did not in FlxPreloader.goToMyURL() (#71)

Performance Improvements

ALREADY FIXED No need to fill a camera twice if not blending alpha (#143)
INVALID Remove small performance issue in FlxG.addBitamp() (#96)
WON'T FIX Refactored FlxObject::preUpdate() to remove uneccessary code (#82)

Bugfixes

Fix FlxGroup#maxSize (#184)
Fix documentation for FlxText#moves (#180)
INVALID Fix FlxSprite.drawLine() incorrect behavior when full transparency set in color (#173)
Fix FlxTilemap.overlapsWithCallback calls callback when no overlapping (#166)
Fix FlxCamera "jitters" when following a target (#134)
NOT APPLIED IN RELEASE? Fix FlxText and problem with camera zoom (#119)
INVALID Fix Mouse.as doesn't like negative cursor offsets mixed with native Flash (#117)
Major cleanup and bug fixing of FlxSound (#114) , (#103) , (#101) , (#92) , (#80)
Fix FlxObject#(overlaps|overlapsAt) checking only first element of FlxGroup (#109)
Fix FlxTilemap not clearing variables before loadMap (#102)
ALREADY FIXED Fix overlapProcessed isn't properly cleared in FlxQuadTree (#100)
ALREADY FIXED Fix FlxTilemap ignoring last tiles if startingIndex > 0 (#99)
Add missing usage of particleClass in FlxEmitter (#95)
ALREADY FIXED Fix FlxTilemap.ray() result value always null (#84)
ALREADY FIXED Fix FlxU.round() giving incorrect results for negative numbers (#79)
ALREADY FIXED Fix FlxU.formatArray() includes first element twice (#77)
Fix health only initialized in FlxSprite, should have been in FlxObject (#74)
Fix incorrect value for moves in FlxTileblock and FlxTilemap (#70)

Repository changes

INVALID Move source to src folder
INVALID Remove documentation (only include it in release builds)
INVALID Add generate-asdoc.sh and generate-swc.sh utilities
INVALID Add .gitignore
INVALID Add CHANGELOG.md

[WingEraser]

Add new FlxTween class (#114)
Major cleanup and bug fixing of FlxSound (#114) , (#103) , (#101) , (#92) , (#80)

The tween class is only used in FlxSound. I rather not touching FlxSound. Someone else might want to take a look if the fixes is needed to be patched. The code differs too much from f-as3 and f-gdx.

[WingEraser]

New issue will be created for porting to v3.0.