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kotlinlang

Great <@U25PH0DBJ> ! I will review it once more tomorrow and look for caveats. Right now I'm wondering if the skin approach I chose is the best way to go, but I can't really think of a better way to implement this, unless it was done in the actual TableRowSkin in OpenJFX of course. I'm not good with names, so some of the classes might need a better name as well, for example the `ExpanderTableColumn` sounds clunky. It is mostly an internal implementation detail, but still.