This still isn't ideal and it uses the Vive controller settings,
but this should work on most controllers thanks to OpenXR's built-in
action remapping and standardised button names.
This aught to be replaced with a proper set of XR input profiles,
at the moment this is *just* enough to get hardcoded button inputs
working with the existing Vive controller config.
Add missing includes on Windows.
Include GLX only on Linux.
Move openxr_platform.h include to OpenXrContext.h. To make this
possible, certain names from GLX/X11 need to be undefined in order to be
now includable in OpenXrInput.h.
Add Overte e.V. copyright.
Co-authored-by: Lubosz Sarnecki <lubosz@gmail.com>
