Make using the color change tool easier: now changes are tracked live

This patch enhances the color select tool to live change the color while selecting. This makes using it a lot easier. It was a feature request from the creative guy in our church, and I figured it would be a nice addition. So here goes, it's not the most efficient solution, but at least on my machine it's not a problem at all. (ps, I haven't forgotten about the slider enhancements, just haven't gotten around to doing it properly yet :(