Update sms app model to use new conversationUpdated signal
Filter incoming messages which belong to a different conversation than the one currently being viewed
Ideally, the Android side should be updated to send a packet on a newly *sent* messages as well. If the user types a message on the phone while the desktop SMS app is running, it would be nice to reflect that. I do not think this will require any changes on the desktop side, but it would be best to get Android working to verify this assumption.
TODO: Dump support for old-style Telephony SMS packets, since the phone now sends new-style as well
TODO: Figure out how to snoop *sent* message on Android and forward those as well