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Speed up autocrop significantly#1

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Commits on May 28, 2020

• Refactor regression tests for better diagnostics.

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• Tests for PNGs, greyscale images, AUTOCROP_ERROR_BLANK and ..._NOCROP

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• Tests for 'border'.

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• $channels makes more sense as 1 or 3, not 0 or 2.

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• Many many corner cases. And edge cases. And lines :-)

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• A faster implementation of _scan().

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• Replace _out_of_range() with two closures().

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• We can terminate the left/right loop if there's no possibility of cropping.

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