refs #382, reviewed audio context handling

* only init QDbusServer for P2P
* changed init order of contexts in runtime
* use "fake" signal to call setComVoiceRooms (remote in GUI)
* added slot to change voice room callsign
* used "org.swift" instead of "net.vatim" (just style)
* used const QString for serviceName
* added correct copyright header (just style)

src/xbus/main.cpp

@@ -22,7 +22,7 @@ XBus::CPlugin *g_plugin;
 PLUGIN_API int XPluginStart(char *o_name, char *o_sig, char *o_desc)
 {
     std::strcpy(o_name, "X-Bus");
-    std::strcpy(o_sig, "net.vatsim.XBus");
+    std::strcpy(o_sig, "org.swift.XBus");
     std::strcpy(o_desc, "Allows pilot client to connect to X-Plane via D-Bus");
 
     XBus::CTraffic::initLegacyData();