ui: Added single file mode to code view

* Added navigation to top of code view for iterating references and switching between list and single file mode
* current file name and reference count is shown on top in single file mode
* refactored scrolling to location or line via request system
* added parameters animated and toTop to scrolling system
* refactored class hierarchy and removed unused stuff in list mode

src/lib_gui/qt/utility/utilityQt.cpp

@@ -6,6 +6,7 @@
 #include <QFile>
 #include <QFontDatabase>
 #include <QPainter>
+#include <QWidget>
 
 #include "utility/file/FileSystem.h"
 #include "utility/logging/logging.h"

src/lib_gui/qt/utility/utilityQt.h

@@ -1,8 +1,12 @@
 #ifndef UTILITY_QT_H
 #define UTILITY_QT_H
 
-#include <memory>
-#include <qwidget.h>
+#include <string>
+
+class QColor;
+class QPixmap;
+class QString;
+class QWidget;
 
 namespace utility
 {