Color scheme

[elliot-nelson]

Come up with a better (larger) slate of colors for the game.

Originally, I was staying true to the idea of a 16-color terminal color scheme (and only ended up using a handful; red, yellow, blue, bright green, white, gray, dim gray).

However, the game would be MUCH better looking and more interesting to play with visibility and shadows, which would look best if we could have a few "shades" (at least 2-3) of reds, blues, grays/whites, etc. Come up with a decent color palette that can then be selected from when drawing text.