app-wish: Set personal state
Can be done on the MR branch or after https://git.card10.badge.events.ccc.de/card10/firmware/merge_requests/117 was merged.
It should show a list of available modes (it could look like the app menu). The user can switch between them with LEFT and RIGHT which sets them transiently. When the user presses SELECT the currently set mode gets set persistently.
The first or last menu option should be a "No state" option which clears any set state.