make savestates for markers optional, per marker

[SuuperW]

A new column has been added to the marker list, which controls if TAStudio will keep a savestate for each specific marker. By default all markers will have states, but this can be changed with a new settings. Clicking on the savestate cell for a particular marker will toggle if it keeps a state.

For markers not keeping a state, the cell will be blank. For markers wanting a state but not having one, the cell will have !. For markers wanting a state and actually having a state, the cell will have ✔.

There might be a better way to design the user interface. Suggestions welcome.

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[vadosnaprimer]

I think it's better to indicate explicitly which markers have states disabled, for example with a cross. Then ones wanting a state could be empty and ones with it could have the checkmark. ! is kinda ambiguous, and cross is very clear.

[SuuperW]

Crosses are sometimes used to "check" things, so I'm not sure that's better. I feel like if a user clicks a box and it toggle between a cross and blank, the cross state would feel more like the enabled state. Though I don't think I've seen crosses used like that anywhere recently, maybe it is rare enough today.

Maybe instead the ! could change to a -, making it more like a three-state checkbox. Or do both, so the box is never blank?

[vadosnaprimer]

I meant a red cross. That never means anything good :D

- is probably fine.

[SuuperW]

Red cross. And dash.

Color.OrangeRed because Red looks bad, especially when the row is selected.

[SuuperW]

Fixed bugs and updated the tooltip text for the new setting because I re-read it and didn't like it.