Added nadaraya-watson channel indicator #698
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Closes #697
Hi! This code will add the nadaraya-watson channel indicator. It was inspired by this, and this, but turned out quite different in how it approaches the calculation. My implementation is more of a "pure" nadaraya-watson regression, and quite frankly, more efficient with less nested loops. In addition, it allows users to use different kernel models to calculate the regressions (Lux's uses the gaussian kernel).
I'm not a mathematician so don't ask me difficult questions.