New GdkColorContext object, ported from the XColorContext in XmHTML.
It compiles and links, but is *completely* untested. Feel free to pound on it. The idea is to do all color management (allocation, etc.) via a GdkColorContext so that apps will be friendly to 8-bit displays. GdkColorContext is supposed to work on all visual/depth combinations. This support, however, is lacking from the rest of Gdk/Gtk. I will try to work on that. - Federico
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