…rain.

Moves to Java11 and OpenJDK via AdoptOpenJDK within the processing4 train using a squash of sampottinger processing fork's java11 branch.

**Primary required changes:**
Some changes directly support OpenJFX / OpenJDK 11:

 - Response to image loading changes caused by [JEP 320](https://openjdk.java.net/jeps/320)
 - Use of jmodules as necessitated by [JEP 261](https://openjdk.java.net/jeps/261)
 - Reponse to largely changed file paths caused by [JEP 220](https://openjdk.java.net/jeps/220).
 - Modifications in build system related to AdoptOpenJDK and Java 11 which have a different naming structure for downloads.
 - Allowing use of non-Oracle Java within internal Processing checks.

**Secondary required changes:**
There were some secondary required changes that impacted the usability of Processing after having moved to OpenJFX / OpenJDK 11:

 - Removal of com.apple.eawt calls related to [JEP 272](http://openjdk.java.net/jeps/272)
 - Response to HiDPI support on Windows and Linux in [JEP 263](https://openjdk.java.net/jeps/263)
- Removal of `java.ext.dirs`. Would be forced by [JEP 220](http://openjdk.java.net/jeps/220).
 - Due to bugs on Windows, updated the JNA jars.
 - Changes in downloader build tasks to support AdoptOpenJDK and OpenJFX.
 - Updated org.eclipse.* / equinox jars.
 - Some optimization around size of distribution.
 - Update of AppBundler.
 - Some changes in formulation of classpath and modifications in PreprocessingService given [JEP 261](https://openjdk.java.net/jeps/261).

**Incidental changes:**
This was (ahem) a bit of a larger PR with the above modifications. So, I wanted to introduce automated tests when possible and convenient along with a few changes for platform sustainability in order to support development:

 - Addition of cross-building capability (!) made possible by AdoptOpenJDK.
 - Addition of mockito for testing.
 - Upgrade of junit.
 - Addition of ant-contrib.
 - Standardized nomenclature around JRE / JDK in `build/build.xml`
 - Deduplication of code in `jre/build.xml`.
 - Addition of JavaDoc in a few places.
 - Some refactoring of PImage / Shape to support increased testing and readability in image manipulation code.

Moves to Java11 and OpenJDK via AdoptOpenJDK

* Adding travis support (hopefully without osx).

Based off of processing 5753, demonstrates the use of Travis to build and test processing Requires use of OpenJDK (processing 5753). Will address processing 2747. Will redirect this to the original processing repo after processing 5753 is resolved.

Note that this supersedes sampottinger/processing's #7 and benfry#70 - this does not include the deploy step.

* Attempt explicit lib addition for linux-based travis build.

* Ask travis for ant optional install.

 License links in top level license file to include third party information. Specifically, in follow up to processing 5753, some updates to the license.txt file, reformatting to make it easier to find third party license information and to navigate the processing license itself.

Updated license text.

* Move to ANTLR 4 with Java 11 lang features and localization.

Introduces ANTLR4 and Java 8 language feature support within IDE while also adding additional hooks for localization of syntax error messages, addressing processing/processing#3054 and processing/processing#3055.

The PR is broadly a continuation of processing/processing#3055, bringing it up to speed with the latest Processing master plus the changes introduced at processing/processing#5753. **Requires processing/processing#5753 as pre-requisite.** This introduces a number of edits beyond processing/processing#3055 beyond compatibility with current Processing master and processing/processing#5753 including:

 - Update to the grammar itself
 - Change ANTLR listeners to emit `TextTransform.Edit` to unify JDT-based `PreprocessingService` and `JavaBuild`, removing code with duplicate purpose.
 - Introduction of syntax error rewriting with support for localization.
 - Addition of complete localized strings set for English and Spanish.
 - Addition of partial localized strings set for other languages.
 - Refactor of ANTLR-related code for testability and readability
 - Expansion of tests including full parse tests for new Java features (type inference, lambdas).

* Ask travis for ant upgrade prior to run.

* Ask Travis for java11 update.

* Add openjdk ppa

* Travis no confirmation on add ppa.

* Force newer ant on travis.

* Swtich ant download to www-us mirror.

* Switch ant to 1.10.7

* Start x for unit tests in travis.

* More complete start x in travis.

* Revert x in travis.

* Try x in services.

Related to feedback recieved on benfry#1, revert changes in docstrings possibly caused by reference mismatch.

Fix minor formattting issue in PImage related to benfry#1.

Fix some recent changes that got lost in the cut over from processing/processing4 for sampottinger forks. Addresses issues raised in benfry#1.

Simple fixes in response to #1 feedback on processing4 mainline

* Refactored TabLineFactory into ProblemFactory.

As part of benfry#1, refactored TabLineFactory into ProblemFactory, merging tests in the process.

* Fix imports on #7.

In response to @benfry feedback within benfry#1, consolidated all of the runtime path calculation into a single class while still maintaining all of the tests and caching logic. This reduces the class count but still adapts to jmod and javafx path calculation requirements for java 11.

Refactor ANTLR message simplification infrastructure to reduce class count within preproc given @benfy feedback within benfry#1. Note that some supporting are left out but those can be further refactored behind classes as desired but strategies are all made anon or inner.

Fix issue reported by @codeanticode within PreprocessorResult.java where the height was not being returned correctly.

Minor fix in PreprocessorResult dimension reporting.

Refactor ANTLR message simplification infrastructure.

Consolidate logic for runtime path generation into a single class.