Add more colors for user text.

For a long time we've been stuck with green, blue, red, black and white for sending text through broadcasts, says, etc. This pull request adds an extra 12 colors, as seen in this image: http://i.imgur.com/c0At8m2.png.

NOTE: the text commands in that image are not the final ones, which will be given in-game when this goes in. RGB values for colors are not exact matches to names due to visibility with the game's color scheme.