Official Material X support

[JeffGillin]

As of 4.2, Blender now has ability to export MaterialX shaders which is huge.

Looks like bevy support has been started. I just wanted to suggest an official port inside bevy.

https://github.com/killercup/materialx

https://projects.blender.org/blender/blender/pulls/122575

[killercup]

Hi, thanks opening this! I'm the one who started the bevy plugin! 👋

Right now, I'm a bit busy with other work but I've made some progress before my summer break, and I plan on picking it up again soon. (Sooner if anyone can sponsor this work, otherwise it's based on how much free time I can sacrifice.)

I added a bunch of notes to the repo, too, incl. the original plan as discussed on discord. If anyone wants to chat with me about this/collaborate, ping me here or on discord :)