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BTW: Updated DXT1+Alpha

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I got around to fiddling with my DXT1 and DXT1+Alpha encoders, and then partly merged them both into a single encoder.

the change is mostly a slight improvement to image quality over the prior encoders:
incorporates slight dithering, more like the DXT5 encoder (and is based on the code from the DXT5 encoder);
uses 4 colors when possible for a block, only falling back to 3-colors when transparent pixels are present;

code here:

included are a few test images (originals, and as-encoded with this encoder).
(ignore duplicate image, site apparently wont allow removing it...).
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