-Adds markings for thick neck (2 sizes and extra for throat coloring)
-Adds colorable versions of the troll horns that were never useful for anything else due to forced color.
-Fixes elf ears missing sprites (todo: upstream pr if i can be arsed to)
-Improves humanoid round gut marking shading contrast. (I was legit surprised that it even had any in the first place. always thought it was just flat while lmao)
