removed old LibOVR
Added Windows-only Oculus SDK v0.4
Updated quakespasm.vcxproj
update Oculus SDK/LibOVR to v0.4.1
support Oculus SDK LibOVR v0.4.1, removed v0.3 support
attempt to implement/port ovrDistortionCap_Overdrive for OpenGL DistortionRenderer and DistortionShaders. stubbed in an overdrive alternative.
Merge branch 'LibOVR_v0.4'