WIP use Tables.Columns instead of `columntable`#247

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kleinschmidt wants to merge 8 commits intomasterfrom

Commits on Sep 13, 2021

WIP replace ColumnTable with Columns
kleinschmidt
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Commits on Sep 18, 2021

WIP
kleinschmidt
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Commits on Oct 25, 2021

Tables does this for us
kleinschmidt
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Commits on Feb 14, 2022

do we _really_ need to specialize on Columns?
kleinschmidt
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