Bugfix/deferred leaks
Fixes Deferred objects not being destroyed properly, especially together with Promise::then(), which lead to callbacks being invoked after the Promise has been destroyed.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes Deferred objects not being destroyed properly, especially together with Promise::then(), which lead to callbacks being invoked after the Promise has been destroyed.