Lots of things, check extended description.

- Added new controls to replicate the camera offset seen in things like
Freelancer.
- Fixed the HUD in player prefab.
- Made the main menu addaptive to resolution (scene pick menu already
had it).
- Created a software mouse which doesn't go off the screen.
- Fixed the prefab disconnect in DenseAstroidField.
- Created a nicer looking crosshair.
- Reworked third person crosshair to use OnGUI instead of a GUITexture.