Selection fixes

[patrikturi]

• added possibility to try selecting / deselecting in StageTest by clicking the labels
• some fixes
• you need only the 3 latest commits, the others are just to sync my fork with the origin, so I think you should cherry-pick the latest 3 commits (I messed up earlier by committing on my master branch)

[StrongJoshua]

Can you squash the commits and resolve the conflicts? I'm sure i'ts just formatting (use the libGDX formatter, it's included in this repo).

[patrikturi]

Updated

• Commit 1: Somehow you duplicated a block of code during the merges
• Commit 2: My original changes rebased and squashed
• Commit 3: Your indentation was like: 1 tab 1 space, or 2 tabs 2 spaces etc...

[StrongJoshua]

Merged. Should go live tonight if I'm not too busy.