Refactor initialization callback system (#243)
Refactor initialization callback system (#243)


threema-ch/threema-web,rugk/threema-web,threema-ch/threema-web,rugk/threema-web,threema-ch/threema-web,rugk/threema-web,threema-ch/threema-web,threema-ch/threema-web,rugk/threema-web