Revision de9001ea

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Various changes to the processing of Patches loaded with the Upscale and Sharpen/Monochrome filters:

If applying both, defer Monochrome until after the Indexed+A to RGBA translation. Doing it the other way around we are relying upon the original palette to have wide-ranged gray scale, otherwise this introduces yet more quantization artefacts.
When doing Monochrome, instead of quantizing back to Indexed+A using the original palette; convert and upload as Luminance+A.
Disabled the SharpenPixels algorithm; I don't know where this came from but it does not do what the function name implies (this appears to be some kind of low-pass bloom). Might as well use the EnhanceContrast algorithm instead.
Added an Amplify algorithm intended for use in combination with Monochrome for font patches (currently applied on everything... but as yet only fonts are loaded using Monochrome).

Doomsday Engine