Ability to reselect previous region

[LadyCailinBot]

WORLDEDIT-3345 - Reported by Snhnry

I've lost track of the number of times I've deselected a region, only to realize that I needed to keep using it. Something like a //resel command would avoid many headaches. This would be especially helpful when using the more advanced selection modes like poly or convex.

[octylFractal]

This is the same as being able to undo a selection action as well.

[Adrien5902]

Would this also involve a redo selection command something like //unresel just like with operations ?

[octylFractal]

Probably, though I think it should probably be //undosel and //redosel, or maybe //undopos and //redopos. Something that is more straightforward.