split up windows functions into a dedicated module with separate files #724
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Which issue does this PR close?
split up windows functions into a dedicated module with separate files
Closes #.
Rationale for this change
in future window functions are getting more and more complex, so we split it up to make it more self-contained and easier to manager
What changes are included in this PR?
purely code refactoring, not logic changes
Are there any user-facing changes?