Octrees for Victory #2514
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Octrees for Victory #2514
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Reimplement the sixel quantization algorithm with an octree-kinda approach. Provides a speedup on most images, supports more color registers (we now request 256 and then 1024), improves quality on some (also costs a slowdown on some images, and reduces quality on many, but I think I know how to fix that). Eliminates weird color divergence in #2503. Obsoletes #1452.