data: save undefined in database field instead of using different node types

* expand toggle also for undefined classes
* changed direction of some template edges
* save same access component to specialized template functions and classes

src/lib/Project.cpp

@@ -7,6 +7,7 @@
 #include "data/access/StorageAccessProxy.h"
 #include "data/graph/Token.h"
 #include "data/parser/cxx/TaskParseCxx.h"
+#include "data/Storage.h"
 #include "data/TaskCleanStorage.h"
 #include "settings/ApplicationSettings.h"
 #include "settings/ProjectSettings.h"