Add option to delete user account
Only in multi-user mode, there should be an option to delete the entire account (with all repos and apps). If default storage is available, this should also delete the repo from the default storage (see #112).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Only in multi-user mode, there should be an option to delete the entire account (with all repos and apps). If default storage is available, this should also delete the repo from the default storage (see #112).