avfilter/paletteuse: add atkinson dithering
Atkinson according to https://bisqwit.iki.fi/jutut/kuvat/ordered_dither/error_diffusion.txt: * 1 1 / 8 1 1 1 1
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Atkinson according to https://bisqwit.iki.fi/jutut/kuvat/ordered_dither/error_diffusion.txt: * 1 1 / 8 1 1 1 1