Better resource pack support for runes #1241

Right now all waystones share the same waystone_runes model, and tinting is hardcoded based on waystone style.
This limits resource packs to 1) have all waystone styles share the same shape, and 2) have to adapt to the predefined tinting.

It would be better if each type had its own runes model (that can just use the shared one as parent) - that way they can be overridden individually. There should also be a way to define the tint color in the resource pack.