Re: ui colors again

http://www.dillo.org/test/color_themes.diff

I was just playing around with making themes selectable. I typed in some
color themes that Jorge has suggested, and typos in them are possible.

I tried using some of the fltk color indices for our tab colors and
button highlight color in order to make the code more uniform, placing
the #defines in prefs for lack of an obviously good location.

It has code to fix the deactivated icons when the background color
changes, but I'm still not very pleased with it.