Use Khronos' OpenXR loader from Maven when supported #1405
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Most of the platforms used to distribute their own implementations/builds of the OpenXR loader. It was traditionally part of the propietary SDKs distributed by vendors. As they were under an EULA we had to keep them in a private repository only available to core devs (obviously any other external dev could download them on their own).
More recently, and driven by the AOSP flavor effort, we started to build the Khronos OpenXR loader from sources. Fortunatelly we got a well documented report explaining how to use the loader directly from the central Maven repository. This greatly simplifies the build process and also improves the open-source feel of the project by reducing our deps with the third-party repo.
So far this option is now available for the following flavors:
It does not work for neither HVR, nor SnapdragonSpaces based devices nor Pico. For these ones we still need to rely on the loader from the SDK.
Fixes #1394