Added brand new TeraOVR library to Terasology and implemented head tracking support for the Oculus Rift - not fully finished yet but it is working quite nicely! Note: The DLLs have to be placed into the natives folder manually at the moment.

* All those fancy constants needed to setup the stereo projection can now be dynamically retrieved from the Oculus device using TeraOVR
* Did some cleanups here and there