Add rgb_color methods

Jamfile: Optimize build output sizeThe goal here is to keep builds reasonably fast for development.Some time hopefully we'll have the ability to specify whether to builda debug or release build. But for now, we're stuck with trying tooptimize both build time and build size simultaneously.Coolcoder613eb proposed four build flags to add. I tested them fortheir effect on build time and size.

Uncomment be_roster attribute