Added faster block splitter variants for levels 3-7 #4176
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Cyan4973
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These faster variants employs lighter sampling, smaller state and different hashing to decide when and where to split a block.
Thanks to their faster speed, it's now possible to apply block splitting heuristics for levels 3 to 7 (strategies
dfast,greedyandlazy), with a negligible speed impact (<2%).Unfortunately, this is still not fast enough for the
faststrategy, which will require a very different variant.silesia.tar:dev