Godot OpenXR 1.2.0

• Added interaction profile for the HP Reverb G2 controllers.
• Removed deprecated com.samsung.android.vr.application.mode meta-data tag.
• Updated repo README.
• Added controller tracking confidence
• Use correct predictive timing for controllers.
• Renamed FPSController node of the first person controller scene to FPController.
• Fixed output range for the trigger and grip values.
• Improvements to swapchain format selection.

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