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dwbuitenAdd tuned deadzoning with two-level biasing and separate EOB biasing The idea is based on what the Thor codebase does (which is undocumented). See comments for details on how the constants were derived, and the algorithm in general. The intent is that this is used as the fast path once we add trellis quantization. This particularly helps high motion clips like Red Kayak and Ducks Take Off: | PSNR | PSNR HVS | SSIM | CIEDE 2000 | MS SSIM | VMAF ducks_take_off_1080p50_60f.y4m | -3.5880 | -4.6035 | -3.3884 | -1.3255 | -4.1065 | -9.5272 red_kayak_360p_60f.y4m | 0.1735 | -2.2590 | -0.4001 | -1.7106 | -1.9463 | -9.1934 AWCY Results: PSNR | PSNR Cb | PSNR Cr | PSNR HVS | VMAF | SSIM | MS SSIM | CIEDE 2000 -0.2979 | -3.7618 | -2.8471 | -0.5794 | -3.3000 | -0.2043 | -0.3993 | -1.5294 AWCY Link: https://beta.arewecompressedyet.com/?job=master-162ee92ca&job=deadzoning1%402019-09-02T14%3A31%3A02.785Z Implements #1338 and #1340. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
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