refs #786, prepare contexts for matching messages

In same step cleaned up contexts a bit
* added function for model set strings
* renamed functions to getModelSet... instead of installed models (the set is smaller and is what we want to use with DBus)
* signal when debug/log flags changed
* removed some \copydoc
* allow to enable/disable rev.lookup/matching messages
* removed reload model function (dangling)

src/blackcore/context/contextaudioproxy.cpp

@@ -48,6 +48,8 @@ namespace BlackCore
                                    "changedMute", this, SIGNAL(changedMute(bool)));
             Q_ASSERT(s);
             Q_UNUSED(s);
+
+            this->relayBaseClassSignals(serviceName, connection, IContextAudio::ObjectPath(), IContextAudio::InterfaceName());
         }
 
         void CContextAudioProxy::leaveAllVoiceRooms()