Merge pull request #3 from FeepingCreature/master

Oculus Rift SDK support
Set up x86 and x64 builds.
Fixed positional movement not working in FreeTrack.
Added ResetOrientation key and interface method.
Added interface selection radio button.
Corrected window title.
Adjusted window position.
Added enable/disable key text.
Fixed persistence.
Disable tracking on errors to prevent spamming the log.
Updated DLL filenames.
Cleaned up "using" statements.
Define and implement IQuatTracker, an interface for a tracker that exports rotation data as authoritive quaternions. Intended to be used with VR trackers like Oculus Rift where adjusting rotation serves no purpose, because you almost always want 1:1. (Exaggerated rotation can cause feelings of sickness!)
Use quaternions for rotation when the tracker supports them.