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Hi, this commit aligns PyOD with PyThresh V1, making it a standard that aligns better with the Sklearn and PyOD API having fit and predict functions. Documentation has been updated and two new thresholders have been made available.

Note, that the minimum requirement for using PyThresh in PyOD is now V1 but the benefits (able to threshold on test data correctly with respect to train data) outweighs the downsides. Older versions of PyOD will still work with the new PyThresh but not vice versus.

Hope you are happy with this commit and that it makes PyOD even better than it already is!