Add VRDevice interfaces and navigator.getVRDevices call
Add VR display item, to be used when vr property is present
Add gfx/layers functionality for VR rendering
Add D3D11 support for VR rendering
Fix up D3D11 genshaders.sh script
Regenerate D3D11 shaders (for VR)
Add GL support for VR rendering
Extend widget's MakeFullScreen method to take a reference rect to use when determining the screen to go full screen on
Extend mozRequestFullScreen to accept an options dict, with a vrDisplay member
package libOVR
Don't cause unnecessary GL errors during GL/WebGL initialization
Create a DEBUG D3D10/11 device on Windows in DEBUG builds