more color work, including removing rgba{_p_}_from_style()
change GTK rc file system to use just a single file, which is color-neutral.

* packaging scripts need modification
* light theme file left in place to help with possible generation of alternate theme
change packaging of GTK rc file for OS X and Linux.

I cannot find the equivalent location for Windows
lots more color work, closer and closer to being ready for ... being taken apart again
another metric ton of color work
more tweaking of color management.

User's own modification to NAME.colors are stored in $CONFIG/my-NAME.colors now.