data: saving typedef to Storage

This change save typedef expressions to the Storage using a node of type Node::NODE_TYPEDEF and an edge of type
Edge::EDGE_TYPEDEF_OF that leads to the original type, with the qualifiers saved as DataType on the edge.

src/lib/data/graph/Edge.cpp

@@ -103,6 +103,8 @@ std::string Edge::getTypeString() const
 		return "is derived from";
 	case EDGE_CALL:
 		return "calls";
+	case EDGE_TYPEDEF_OF:
+		return "is typedef of";
 	default:
 		LOG_ERROR("TypeString not implemented for edge type.");
 	}

src/lib/data/graph/Edge.h

@@ -20,7 +20,8 @@ public:
 		EDGE_PARAMETER_TYPE_OF,
 		EDGE_USAGE,
 		EDGE_CALL,
-		EDGE_INHERITANCE
+		EDGE_INHERITANCE,
+		EDGE_TYPEDEF_OF
 	};
 
 	enum AccessType

src/lib/data/graph/Node.cpp

@@ -266,6 +266,8 @@ std::string Node::getTypeString(NodeType type) const
 		return "namespace";
 	case NODE_ENUM:
 		return "enum";
+	case NODE_TYPEDEF:
+		return "typedef";
 	}
 	return "";
 }

src/lib/data/graph/Node.h

@@ -22,7 +22,8 @@ public:
 		NODE_FUNCTION,
 		NODE_METHOD,
 		NODE_NAMESPACE,
-		NODE_ENUM
+		NODE_ENUM,
+		NODE_TYPEDEF
 	};
 
 	Node(NodeType type, const std::string& name);