data: fixes and improvements

* save forward declarations of classes and structs as NODE_UNDEFINED_TYPE
* put whole files on top in snippet sorting
* uses aggregation count as weight in graph layouting instead of adding all edges to graph
* refreshing all views of components on MessageRefresh in ComponentManager
* reloading ApplikatinoSettings on MessageRefresh

src/lib/Application.h

@@ -25,6 +25,7 @@ class Application
 {
 public:
 	static std::shared_ptr<Application> create(ViewFactory* viewFactory);
+	static void loadSettings();
 
 	~Application();