Up until now, when encountering an OpenXR error / exception in debug
mode, only the raw OpenXR error enum int value would be displayed, which
wasn't really descriptive nor useful. To remedy this, this commit adds
an `xrResultToString` call to additionally convert this value into its
corresponding enum string.
See PR for an example error print.
Pull Request: https://projects.blender.org/blender/blender/pulls/142582
9d95f02e83