Issue #88 add horns all frames

[jrconway3]

Related to:
#88

Added horns to all frames along with recolors. I also did a couple extra things:

1. Backwards Horn's "Back" horn on the side animation is now a separate layer. This looked fine on the "Lizard" head model but didn't look great on the human head models, so now it should look better.
2. Horns have hair, body, and metal as recolors. The base horn color is still present and is the default.
3. Included the palette json file containing all three in one for future horns.

Naturally the directory also contains "adult" in it, so later we can add child horns which I really do want to do eventually as well.

I was going to include the tails in this, but that will take a bit longer and even with just the horns alone this is still a lot of asset changes. And, hey, its nice having a "smaller" PR for a change, right? :P

[jrconway3]

This PR was still open, so I dropped a quick fix for Monocle here as well:
#164

Not a big enough issue to open a PR just for it lol