libgdx-utils as 3rd party extension

[dermetfan]

I'd like to add my little support library as a 3rd party extension to the gdx-setup app. Users already asked for this in the past before the XML configuration existed.

Does your project aim to extend LibGDX with a specific goal in mind?

The goal is to offer additional features (like pre-made scene2d.ui widgets, the TmxMapWriter, AnnotationAssetManager or the PolygonRegionLoader which was merged into libGDX) and utility/helper classes to make game dev even more convenient. I'd let that count as specific enough even though it's rather broad.

Is your project useful to LibGDX users?

I think so, it's catered towards them.

Is your project well established?

Depends on what is well established enough. The repository currently has 9 forks and 46 watchers on Bitbucket. The only statistics I have are those from sonatype:

Your project is well maintained

There was not a single month without commits since I started this project in September 2013 and it's usually compatible with the latest libGDX release.

[MobiDevelop]

I'm okay with adding your library to the setup, will let @Tom-Ski verify it all looks good since he's the setup-keeper.

[Tom-Ski]

Yup will do. Just need to find time to test the html extension stuff. Ill try to do that tomorrow. This PR will need adapting after that is merged though.

[Tom-Ski]

Ok @dermetfan if you could fix up your PR, include your GWT includes also, then rebase to one commit and I'll merge.

[dermetfan]

Sorry @Tom-Ski, what does including my GWT includes mean? AFAIK extensions.xml can't declare modules to inherit in GdxDefinition(SuperDev).gwt.xml.

[kotcrab]

After merging #2934 gwt inherits are now supported, see extensions.xml.

[dermetfan]

Cool, thanks @kotcrab. see #2961