Blender Git Loki

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Merge branch 'master' into temp-openxr-blenderside

Ghost: Ghost-XR API to abstract away and access OpenXR functionality

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

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Make it obvious that the DRW context getters are not for general use

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Fix comment being printed to console in Windows batch file

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Merge branch 'temp-openxr-ghostxr' into temp-openxr-blenderside

Merge branch 'master' into temp-openxr-ghostxr

Merge branch 'temp-openxr-ghostxr' into temp-openxr-blenderside

Merge branch 'master' into temp-openxr-ghostxr

Remove leftover from merge conflict

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Cleanup and correct wrong bpy.app.build_options usage

Remove in-place call to create reports-popup

To be replaced by D7113.

Cleanup: Add comments on GPU data and Ghost context usage

Add more info to blender_oculus batch file

Cleanup: Address various review comments

Cleanup: Run clang-format on all affected files