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/element/QtCodeFileTitleButton.h

@@ -0,0 +1,32 @@
+#ifndef QT_CODE_FILE_TITLE_BUTTON_H
+#define QT_CODE_FILE_TITLE_BUTTON_H
+
+#include <QPushButton>
+
+#include "utility/file/FilePath.h"
+#include "utility/TimePoint.h"
+
+class QtCodeFileTitleButton
+	: public QPushButton
+{
+	Q_OBJECT
+
+public:
+	QtCodeFileTitleButton(QWidget* parent = nullptr);
+	virtual ~QtCodeFileTitleButton();
+
+	void setFilePath(const FilePath& filePath);
+	void setModificationTime(const TimePoint modificationTime);
+	void setProject(const std::string& name);
+
+	void checkModification();
+
+private slots:
+	void clickedTitle();
+
+private:
+	FilePath m_filePath;
+	TimePoint m_modificationTime;
+};
+
+#endif // QT_CODE_FILE_TITLE_BUTTON_H