Implement PBR Maps Node

[blessedcoolant]

Summary

Implement the node and UI to generate PBR Maps from a single given image. Based on: https://github.com/joeyballentine/Material-Map-Generator

All images now have a new context menu item called "Filters" where we can add individual image filters and image actions starting with PBR Maps.

QA Instructions

1. Right click any image. Try with various images just to make sure nothing breaks.
2. Filters > Create PBR Maps
3. The models should auto download the first time.
4. Three new images should get created in your board - normal map, roughness map and a displacement map.

Merge Plan

Test and merge. I'd just note that we might want to host these models somewhere ourselves incase to make sure it does not break in the future.