2 fixes and 1 feature#16

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prevosti wants to merge 3 commits intodarach:masterfrom

Commits on Nov 19, 2018

Adds the window operator object into the Temporal functions. This way an Aggregate function can call for a tick() on the window even for clock based windows.
panickos
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fixes typo.
panickos
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Commits on Nov 23, 2020

Fix size() function in SlidingWindow
prevosti
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