Implement edge removal, fix commit

...cationGraphEditor/LocationGraphEditorWidgetController.cpp

...LocationGraphEditor/LocationGraphEditorWidgetController.h

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

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

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

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

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

...LocationGraphEditor/widgets/graph_scene/ControlWidget.cpp

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

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