refs #789, FSX errors OPERATION_INVALID and EXCEPTION_UNRECOGNIZED_ID

* only emit aircraft as rendered when object id is received, not before
* added CSimualtedAircraft to CSimConnectObject (so it can be used as signal argument)
* some utility functions to get callsign/simobject by id

src/plugins/simulator/fs9/simulatorfs9.cpp

@@ -170,7 +170,6 @@ namespace BlackSimPlugin
             client->setPlayerUserId(m_fs9Host->getPlayerUserId());
             client->start();
 
-
             m_hashFs9Clients.insert(callsign, client);
             updateAircraftRendered(callsign, rendered);
             CSimulatedAircraft remoteAircraftCopy(newRemoteAircraft);