Oculus VR DK2 Support

- Updated to work with 0.5.x SDK
- Uses Oculus Rendering rather than PostFX
- Stereo rendering refactored so more rendering info is grabbed from the DisplayDevice
- Implements an Offscreen Canvas for in-game gui with oculus
- Message dialogs and metrics display can now go to the OffScreen Canvas (if oculus demo is setup correctly)

Engine/source/platform/input/oculusVR/oculusVRUtil.h

@@ -25,7 +25,12 @@
 
 #include "math/mPoint2.h"
 #include "math/mMatrix.h"
-#include "OVR.h"
+#include "OVR_CAPI_0_5_0.h"
+
+// NOTE: math code in oculus uses "Offset" which is a preprocessor macro
+#define TorqueOffset Offset
+#undef Offset
+#include "Extras/OVR_Math.h"
 
 namespace OculusVRUtil
 {
@@ -48,4 +53,6 @@ namespace OculusVRUtil
    void convertMagnetometer(OVR::Vector3f& inMagnetometer, VectorF& outMagnetometer);
 }
 
+#define Offset TorqueOffset
+
 #endif   // _OCULUSVRUTIL_H_