Source/OpenXR SDK Dependency

= OpenXR-SDK Dependency =

Notes about maintaining the OpenXR-SDK library dependency.

Updating to new Version
Repository: https://github.com/KhronosGroup/OpenXR-SDK Note: Use the OpenXR-SDK repository, NOT the OpenXR-SDK-Source one!


 * `build_files/build_environment/cmake/xr_openxr.cmake`: may require version number changes
 * `build_files/build_environment/cmake/versions.cmake`: update `XR_OPENXR_SDK_VERSION` and `XR_OPENXR_SDK_HASH` (MD5 of .tar.gz)
 * `build_files/build_environment/install_deps.sh`: update `XR_OPENXR_VERSION` and `XR_OPENXR_REPO_UID` (commit hash)
 * `build_files/cmake/platform_win32.cmake`: may require version number changes

Remember to always check the specification's change log for compatibility breaking changes.