render.c: RGB2 now gets the right color from the RGB color map.
And a first cut at handling transparancy values properly. However to do this we merely needed to pixmap.[ch]: write our own routines for retrieving a close colormap index given a pixel value. Well, and also had to video_chroma/i420_rgb.[ch]: save the RGB colormap that is allocated. Modules.am: forgot new pixmap.c others: more misc abstraction/cleanup
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