[Material] Support Car Paint Shader

I’m surprised that SketchFab has a lot of standard tools,
but the only complaint is that there is no car paint material.

To express concept cars and product design,
There is a limit of expression in the combination of existing material and clear coat.
If there are flake effects and layer shaders like in UnrealEngine,
I think that I can do more advanced expressions.

This material can be used by simply importing it into usr’s project,
and they can use it without trial and error or difficult settings.

What’s more, this material is very lightweight and does not affect drawing performance.

I think it will be very amazing when this is introduced.