Refactor MaterialColors to Array #576
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Why does MaterialColors use a BTreeMap? The entire data structure
[Color3uint8;21](63 bytes) can fit into a Variant (64 bytes) on the stack. The FromIterator and IntoIterator stuff added here is neat, but the serde implementation is no longer derivable.Notes:
From<T:Into<BTreeMap>>is no longer supported, butFromIterator<(TerrainMaterials, Color3uint8)>can be used instead, and arguably should have been used in the first place.