* 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 https://github.com/processing/processing/issues/3054 and https://github.com/processing/processing/issues/3055.
The PR is broadly a continuation of https://github.com/processing/processing/issues/3055, bringing it up to speed with the latest Processing master plus the changes introduced at https://github.com/processing/processing/pull/5753. **Requires https://github.com/processing/processing/pull/5753 as pre-requisite.** This introduces a number of edits beyond https://github.com/processing/processing/issues/3055 beyond compatibility with current Processing master and https://github.com/processing/processing/pull/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.
Also now prioritizes error messages on a single line for display to the
user, since ECJ doesn't always get that right, reported mismatched
argument lists when there's a syntax error and so on.
