Horizontal/Vertical shift threshold#106

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tybrd916 wants to merge 8 commits intomapbox:mainfrom

tybrd916:horizontal_shift_threshold

Commits on Mar 1, 2022

Slows performance significantly, but check for horizontal plus/minus 3 pixel shifts in text
tybrd916
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Adding verticalShiftPixels parameter to pixelmatch as well
tybrd916
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Performance improvement, only do pixel horizonal/vertical shifting if original pixel does not match
tybrd916
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