[AD] subtractive blending

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Thought a bit more about this and talked to Trent yesterday in IRC and
it's actually almost trivial to add. Took me about an hour making the
attached patch which allows subtractive blending for A5.

We're also expecting a patch for a shaders addon from Dario FF any day
now so the whole blenders are obsolete - but if we are to keep them I'll
apply the patch and fix up the memory blenders as well.

-- 
Elias Pschernig <elias.pschernig@xxxxxxxxxx>





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