Unregisters the currently logged-in user device from receiving push notifications from AppGyver's hosted Cloud Mesh backend.
In practice, this happens by removing the current device's push notification token from the user's metadata.
Requires the user to be logged in and the app to use AppGyver Auth for authentication. The device must also be connected to the Internet.
No input arguments.
Number of outputs: 2
No output arguments.
Thrown if the push notification unregistration fails for an unknown reason.