[SHELVED] Material Layering Feedback for 4.19

[MGGeymonat]

@Oskar_Swierad

These are very good points! Gears of War 4’s Coalition had a way (in their custom material system) to bake down several layers into flattened ones - but skipping those intentionally marked as dynamic/tiled. The materials seems also to be easy to assign and swap. Unfortunately the presentation is behind a paywall. https://dl.acm.org/citation.cfm?id=3085026&dl=ACM&coll=DL

I would add a +1 to being able to flatten layers down, this would help immensely with optimization and material LODs