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/component/controller/CodeController.cpp

@@ -110,11 +110,6 @@ void CodeController::handleMessage(MessageFocusOut* message)
 	getView()->defocusToken();
 }
 
-void CodeController::handleMessage(MessageRefresh* message)
-{
-	getView()->refreshView();
-}
-
 void CodeController::handleMessage(MessageShowFile* message)
 {
 	CodeView::CodeSnippetParams params;