This was a request by @Bollebib after talking with him over IRC. It sounded like this was an easier way to toggle the filtering on and off.
I also added a group toggle to turn filtering on and off. If color filtering is off, all colors are shown. I think this is more clear than the "All" option that toggles everything being checked or not.
here is a picture of what it looks like.
I made this patch on a Windows OS, so not sure how it will apply with the line endings and such.