Completed graphics for every race/color

The animations are not yet complete. Also note that I saved these images
as .png instead of .jpg to preserve transparency. I have also included
different resolutions: one hi-res version, and one lower-res version
that matched the dimensions originally used by Marissa in the
TownTester. I also created a .jpg version just for the town tester to
preserve its functionality, but we should make the switch to .png.