added sliding-window functions sliding and slidingWithSizeAndStep#212

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FloWi wants to merge 3 commits intopurescript:masterfrom FloWi:sliding-window

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Commits on Apr 20, 2021

added creator-function rangeWithStep and window-functions sliding and slidingWithSizeAndStep
FloWi
committed
introduced rangeWithStep', that works on a mutable array and takes a mapping function
FloWi
committed
improved docs and tests based on code review
FloWi
committed