Move tint colors from model surfaces to block

[leMaik]

In Minecraft, tint colors are per-block. We should change this to allow users to customize tints per block and to implement tinting for #1332, which needs the hard-coded tints that Chunky already has in the models.

[leMaik]

This pretty much means backporting these two commits from #1332: a4788febe86e2abd1601d8e22e693ec246d21b0e and fe7162758950aca17e8f13f3d8c07e144498d55c