Remove VRMLoader

[0b5vr]

Why

To catch up with r138 changes

What

Remove VRMLoader.

See: mrdoob/three.js#23414

(clarification: it was an implementation of VRM which was not maintained. as mrdoob mentions, people should use @pixiv/three-vrm instead.)

Question

What was the purpose of OTHER_FILES.txt again?
I kinda want to document this in a separated PR since I forgot 😅

Checklist

• Checked the target branch (current goes master, next goes dev)
  • it's a r138 change so it should be directed to dev
• Added myself to contributors table
• Ready to be merged

[joshuaellis]

It's basically to say that these files are included in the type system but aren't accessed by the source, i'm not sure more than that unfortunately.