Merged project with OVR stuff

Added a platform generator with an OVR player and two stereo cameras.
Made a skeleton overlay for GUI stuff. Not sure if a textured plane will
work with sprites - if we use ortographic cameras we need to use two,
and lens distortion seems to have a negative effect  -
https://developer.oculusvr.com/forums/viewtopic.php?f=37&t=3217 (last
post)