Re: ui colors again

I wrote:
> 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.

Committed.

- I changed the inactive icon appearance some more.
- By default it's using the fltk default colors.
- It might be nice to be able to specify the selection color, too.