* TODO: [2/8]
** DONE (set-marker MARKER nil) for performance
** DONE C-g deactivates regions first, before disabling multiple-cursors
** TODO remove mark-multiple integration
** TODO refactor
   an object with all the current state, used for both overlays and current
** TODO add tests
** TODO more state to save per cursor: er/history
** TODO collapse cursors at same point
** TODO unknown command: (t)ry all or (i)gnore -> (did that work ok? (k)eep doing that or (d)on't)