Implement color lookup table generation

[darkf]

We should generate (either on the client or setup side) the color_lut and color_rgb look-up tables (see lut/) from color.pal.

We can then generate intensityColorTable from them (see colortest.html which needs refactored and rewritten in TypeScript.)

[darkf]

Note that we now supply the intensityColorTable with the game, so generating it would just be a nice-to-have.