Signal-Windows
                                
                                
                                
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                        prevent notifications from firing until the queue is empty on startup/reconnect
As has been discussed in #98, we should wait until we have drained the queue before we fire unneccessary notifications.
Requires libsignal support, but the changes should be minor.
libsignal is now supporting this.
OnMessage is now called with a SignalServiceMessagePipeMessage, which may be a SignalServiceMessagePipeEmptyMessage.