Arbitrary Layers for Shapes, Config Resolver

[Ruling-0]

This PR has two primary features:

1. Arbitrary layers for shapes. Allows providing an arbitrary number of textures and tints for shapes. Layers are rendered one atop the other, each tinted their respective tint. Similar to the Material system in GT-Modern, but since 1.7.10 does not use json item models, just does path checks for layer textures.
2. Config resolver. Allows mods to specify material:shape pairs by string and then resolve them through the API. Necessary since metadata is not stable across versions, and requiring tedious updates to account for ID shifting is bad.

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