Extends Ghost to include an abstraction for OpenXR, which I refer to as Ghost-XR. Such an API is the base for the following commit, which introduces VR support to Blender. Main features: * Simple and high-level interface for Blender specific code to call. * Extensible for muliple graphics backends, currently OpenGL and a DirectX compatibility layer are supported. * Carefully designed error handling strategy allowing Blender to handle errors gracefully and with useful error messages. * OpenXR extension and API-layer management. * OpenXR session management. * Basic OpenXR event management. * Debug utilities for Ghost-XR and OpenXR For more information on this API, check https://wiki.blender.org/wiki/Source/Interface/XR. Reviewed by: Brecht Van Lommel Differential Revision: https://developer.blender.org/D6188
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