OpenVR SDK 2.2.3

• New VREvent_DesktopMightBeVisible: Sent when any known desktop related overlay is visible
• New VREvent_DesktopMightBeHidden: Sent when all known desktop related overlays are hidden

IVRCompositor:

• Added SubmitWithArrayIndex.

IVRDisplayComponent:

• Add documentation on the new ComputeInverseDistortion method.

IVRChaperone:

• Amend comments about GetPlayAreaRect to the correct description of its behavior.
• Add documentation on the chaperone json file.