[AD] auto convert bitmap mask to alpha channel

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Attached is an implementation of a proposal to allow the programmer to
have Allegro auto convert a color mask to an alpha channel upon
loading an image. It's most useful when loading a font:

font = al_load_font("a4font.bmp");

I realize you could load the bitmap, convert the mask, save it as a
tga file, reload the font, etc. It's mostly meant as a way not to
scare people transitioning from A4 with lots of old data files.

Alternatively, there could be an al_load_masked_bitmap_font() or something.

Or people could just be told to suck it up and convert all of their
files. I have no strong feelings about it.

Matthew Leverton

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