ui: graph showing neighbours

The graph view can now display the n1 neighbours of the active node, including connections between neighbours.

src/app/qt/view/graphElements/QtGraphEdge.h

@@ -20,6 +20,11 @@ public:
 	virtual void ownerMoved();
 	virtual void targetMoved();
 
+	virtual void removeEdgeFromScene();
+
+	virtual std::weak_ptr<GraphNode> getOwner();
+	virtual std::weak_ptr<GraphNode> getTarget();
+
 private:
 	std::weak_ptr<GraphNode> m_owner;
 	std::weak_ptr<GraphNode> m_target;