Register std::vector<DataContainer*> and std::vector<AbstractPipeline*> as Qt...

Register std::vector<DataContainer*> and std::vector<AbstractPipeline*> as Qt meta types in mainwindow.cpp to support them in Qt signals (even though I do not understand why the issue did not arise before...)

application/gui/mainwindow.cpp

@@ -142,6 +142,8 @@ namespace campvis {
         _dcInspectorWidget = new DataContainerInspectorWidget();
         this->populateMainMenu();
 
+        qRegisterMetaType< std::vector<DataContainer*> >("std::vector<DataContainer*>");
+        qRegisterMetaType< std::vector<AbstractPipeline*> >("std::vector<AbstractPipeline*>");
         connect(
             this, SIGNAL(updatePipelineWidget(const std::vector<DataContainer*>&, const std::vector<AbstractPipeline*>&)), 
             _pipelineWidget, SLOT(update(const std::vector<DataContainer*>&, const std::vector<AbstractPipeline*>&)));