Gamebar

- Gamebar is now done using the Unity GUI stuff.
- When changing the resolution the label and buttons are no longer drawn
outside of the camera view.
- It is by far not done yet. Much improvements will be made.
- The gamebar background is repeated so it is never stretched.
- MSpaint screwed the texture so the alpha layer is gone.
- GUI style file which is used for defining the style of the gamebar
- The old menubar is disabled by default.