Female head highlights

This should fix #12. I corrected the head highlight and shadow direction where it was reversed, for all of the human female layers.

I also reduced the layers to the 10-color (not including transparent) palette from the standard LPC assets; that way I could fix the highest-contrast image, and then use palette-swapping to generate the other color schemes. (The "bow" and "thrust" animations were using colors slightly outside the standard palette, mostly around a few of the outlines.)