Mac keyboard shortcuts for undo/redo

[rschroll]

RMStylusButton simulates keystrokes to trigger the undo and redo actions. The reMarkable has two sets of keyboard shortcuts for use with the Type Folio. We're currently using the "Windows" shortcuts (Ctrl-Z and Ctrl-Y), but the "Mac" shortcuts are different (Alt-Z and Alt-Shift-Z). It doesn't seem that I can change my shortcuts setting without a Type Folio, so I can't check whether RMStylusButton works when you have the "Mac" shortcuts selected.

If you are able to check, please comment here about whether they work. If they don't, it should be relatively easy to add an option to use the Mac shortcuts instead.