Fix clicking TAStudio column header with non-contiguous rows selected

[YoshiRulz]

...and prepare for #1399. To finish that I just need to figure out where TAStudio would get called into when buttons are pressed, since that's normally handled via InputManager I believe, and then call TAStudio.TasView_ColumnClick(null, new() { Column = new() { Name = button } }) or w/e.

[SuuperW]

Reduce enumerations of selection in TAStudio.TasView_ColumnClick

I do not think you actually did this. There seem to be two immediately before this commit and two immediately after. Before: foreach and then Count. After: ToArray and then foreach. (And 1 enumeration in master, 3 in this branch) But I guess it's still an improvement since iterating over the array should be faster than the InputRoll re-constructing the rows based on individual cells?

But, this seems fine anyway. Toggling a button on 1,000,000 rows is faster than actually selecting them in the first place.