GWT LibGDX annotation system.

- Replaces old GWT annotation system.
- includes support for annotation parameters.
- No support for methods (yet).
Add GWT method annotation support, including parameters.
Rid World.java of defunct GWT annotation workarounds.
Add missing linebreaks.
Merge pull request #145 from junkdog/feature-gwt-annotation-parameter-support

GWT Annotation parameter support