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/QtCodeSnippet.h

@@ -31,6 +31,7 @@ public:
 	virtual ~QtCodeSnippet();
 
 	QtCodeFile* getFile() const;
+	QtCodeArea* getArea() const;
 
 	uint getStartLineNumber() const;
 	uint getEndLineNumber() const;
@@ -43,7 +44,7 @@ public:
 	void setIsActiveFile(bool isActiveFile);
 
 	uint getLineNumberForLocationId(Id locationId) const;
-	int getStartLineNumberOfFirstActiveScope() const;
+	uint getStartLineNumberOfFirstActiveLocationOfTokenId(Id tokenId) const;
 	QRectF getLineRectForLineNumber(uint lineNumber) const;
 
 	std::string getCode() const;