ui: Refactored context menu API, added file path actions in graph and code

* Add 'copy full path' and 'show containing folder' actions to graph view, code view
* Added file path to file node tooltip

bug id = 320

src/lib_gui/qt/view/graphElements/QtGraphNodeData.h

@@ -1,6 +1,8 @@
 #ifndef QT_GRAPH_NODE_DATA_H
 #define QT_GRAPH_NODE_DATA_H
 
+#include "utility/file/FilePath.h"
+
 #include "qt/view/graphElements/QtGraphNode.h"
 
 class QtGraphNodeData
@@ -11,6 +13,7 @@ public:
 	virtual ~QtGraphNodeData();
 
 	const Node* getData() const;
+	FilePath getFilePath() const;
 
 	// QtGraphNode implementation
 	virtual bool isDataNode() const;