Make it possible to trigger on shortcuts deactivation

Aleix Pol Gonzalezrequested to merge
work/deactivation into master

Includes globalShortcutReleased which allows us to get notified when one of our actions stops being pressed.

Allows us to implement things like Push-to-Talk.

Draft because I am not sure the X11 code path is correct

Edited by Aleix Pol Gonzalez

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