Oculus Rift support for Return to Castle Wolfenstein: Enemy Territory.

Todo List:

- Stereoscopy
- Zoom needs mono-view
- Possibly lasersight aim
- Or possibly rifle aim (harder to do, is it worth it?)
- Aiming with head (yaw, pitch, roll)
- Controller/keyboard aided
- UI/HUD conversion
- FOV/perspective adjustment
- Warp-shader
- Possibly remove hit blowback
- Adjust gunheight
- Linux/Mac support as well

Long term:
- Unpaired gun and view