src: converted NodeType to a class

NodeType internally still uses the Type enum

src/lib_gui/qt/view/QtGraphViewStyleImpl.h

@@ -8,8 +8,8 @@ class QtGraphViewStyleImpl
 {
 public:
 	virtual ~QtGraphViewStyleImpl();
-	virtual float getCharWidthForNodeType(Node::NodeType type);
-	virtual float getCharHeightForNodeType(Node::NodeType type);
+	virtual float getCharWidthForNodeType(NodeType type);
+	virtual float getCharHeightForNodeType(NodeType type);
 	virtual float getGraphViewZoomDifferenceForPlatform();
 };