[Dillo-dev] ui colors again

Today I dug up the old ui colors patch from last September, ripped out the part that used system colors as defaults that was a problem*, and played around with it a little. I really like configurable colors, so, since I haven't heard anyone say anything like feature freeze yet, I'll make another push for this thing. One difference from the previous code is that I'm using inactive() on the images for inactive toolbar buttons because our gray pixmaps tend not to look so good with different UI colors. It might be good to pull it somewhat closer to the background color, but I'm not sure yet. * Under X, FLTK tries to "Read colors that KDE writes to the xrdb database", which may or may not work fine for those people running KDE, but...