Add VR support to xedit-lib

[W-Drew]

The version of xEdit in use already supports VR. We just need to add piping to them.

Note: in the load order fixes for DLC / creation club content, the VR copies of the games normally do not provide DLC, but it is common for users to backport them manually as many flatscreen mods that are desirable to use in VR set them as masters.

Changes can be verified with the build attached to https://github.com/z-edit/zedit/pull/303