Support for the pre OpenXR version.

Hey everyone. It is now possible to change your ADVR version back to Ancient Dungeon ea0.1.2.2 (the version before the OpenXR update from roughly one year ago) in order to enjoy outdated mods or to check out how the game looked back then.

Find out how to change versions here: https://ancient-dungeon-vr.fandom.com/wiki/Switching_to_an_old_version