Godot XR Tools 4.0.0 Beta 1

This is a beta release of XR Tools that will run in Godot 4 and is on-par with Godot XR Tools 3.2.0 feature wise.

NOTE Godot 4 Beta 15 has a breaking change, this release can only be used with Godot 4 Beta 14. For Beta 15 onward #343 is required to be included.

Note, due to recent breaking changes this only works with Godot 4 beta 14 and newer.
Also due to a current bug in Godot 4 you may experience a crash the first time the project is opened, and further issues the second time.
We recommend opening the project 3 times.
The issue here is that the Godot 4 engine caches information about your project and your project will not run correctly without the cached data. It requires a full load in order to build this cache after which things run fine. This does not effect exporting your project.

This issue is actively being worked on by the Godot team.