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/QtCodeNavigateable.h

@@ -0,0 +1,38 @@
+#ifndef QT_CODE_NAVIGATEABLE_H
+#define QT_CODE_NAVIGATEABLE_H
+
+#include <set>
+
+#include "utility/file/FilePath.h"
+#include "utility/TimePoint.h"
+#include "utility/types.h"
+
+#include "component/view/helper/CodeSnippetParams.h"
+
+class QRectF;
+class QAbstractScrollArea;
+class QWidget;
+
+class QtCodeNavigateable
+{
+public:
+	virtual ~QtCodeNavigateable();
+
+	virtual QAbstractScrollArea* getScrollArea() = 0;
+
+	virtual void addCodeSnippet(const CodeSnippetParams& params, bool insert = false) = 0;
+
+	virtual void requestFileContent(const FilePath& filePath) = 0;
+	virtual bool requestScroll(const FilePath& filePath, uint lineNumber, Id locationId, bool animated, bool onTop) = 0;
+
+	virtual void updateFiles() = 0;
+	virtual void showContents() = 0;
+
+	virtual void onWindowFocus() = 0;
+
+protected:
+	void ensureWidgetVisibleAnimated(QWidget* parentWidget, QWidget *childWidget, QRectF rect, bool animated, bool onTop);
+	void ensurePercentVisibleAnimated(double percent, bool animated, bool onTop);
+};
+
+#endif // QT_CODE_NAVIGATEABLE_H