Add ArViz visu, improve change handling

...navigation/gui-plugins/LocationGraphEditor/CMakeLists.txt

...x/navigation/gui-plugins/LocationGraphEditor/GuiGraph.cpp

...arx/navigation/gui-plugins/LocationGraphEditor/GuiGraph.h

...cationGraphEditor/LocationGraphEditorWidgetController.cpp

...LocationGraphEditor/LocationGraphEditorWidgetController.h

...rmarx/navigation/gui-plugins/LocationGraphEditor/Visu.cpp

.../armarx/navigation/gui-plugins/LocationGraphEditor/Visu.h

...i-plugins/LocationGraphEditor/widgets/EdgeTableWidget.cpp

...gui-plugins/LocationGraphEditor/widgets/EdgeTableWidget.h

...-plugins/LocationGraphEditor/widgets/VertexDataWidget.cpp

...ui-plugins/LocationGraphEditor/widgets/VertexDataWidget.h

...plugins/LocationGraphEditor/widgets/VertexTableWidget.cpp

...i-plugins/LocationGraphEditor/widgets/VertexTableWidget.h

...ui-plugins/LocationGraphEditor/widgets/default_colors.cpp

...plugins/LocationGraphEditor/widgets/graph_scene/Scene.cpp

...i-plugins/LocationGraphEditor/widgets/graph_scene/Scene.h

...lugins/LocationGraphEditor/widgets/graph_scene/Widget.cpp

...igation/gui-plugins/LocationGraphEditor/widgets/utils.cpp

...avigation/gui-plugins/LocationGraphEditor/widgets/utils.h