Handle users joining and leaving properly in audio context and gui

Before this change signals when users were joining or leaving
the voice room were not properly handled. A new signal in audio
context is emitted now and gui will rebuild the user list when it
is emitted.

src/blackgui/components/voiceroomscomponent.h

@@ -51,13 +51,13 @@ namespace BlackGui
             //! Set the voice room url fields (checkboxes, line edits)
             void ps_updateAudioVoiceRoomsFromContext(const BlackMisc::Audio::CVoiceRoomList &selectedVoiceRooms, bool connected);
 
+            //! Update voice room views
+            void ps_updateVoiceRoomMembers();
+
         private:
             //! Set the URL fields
             void setVoiceRoomUrlFieldsReadOnlyState();
 
-            //! Update voice room views
-            void updateVoiceRoomMembers();
-
             QScopedPointer<Ui::CVoiceRoomsComponent> ui;
         };