Issue 149 Unified Head Directories, Mapped All Heads to All Frames

[jrconway3]

This is mostly just fixing the following issue:
#149

Because I dropped all subdirectories that included universal/ sit/ etc, I decided to unify the subdirectories by having each "type" of head have its own directory. So these either contain female/male/child or adult/child depending on if said assets have a male/female swap or not. Even if there is no "child" or "male/female" then "adult" still exists standalone in case those are added later.

However, the sheet definitions haven't changed because obviously the intent is to allow the heads to be easily swappable. I only unified the directories for each head type, but the sheets are still fully interchangeable (except child heads obviously only work on child bodies, but male/female heads work on any non-child bodies as before).

I also had to add an extra color palette to the body assets because some of the fur colors have an extra lighter palette color that most bodies don't seem to have.

[fnaith]

what the productivity !

[jrconway3]

Added another quick fix I just noticed:

Accidentally screwed up the lightest colors on wolf and wartotaur. So I quickly fixed those. The only other ones that look like may possibly be issues were boarman and pig, but they appear to be fine.