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/settings/ApplicationSettings.cpp

@@ -301,6 +301,16 @@ void ApplicationSettings::setCodeSnippetExpandRange(int range)
 	setValue<int>("code/snippet/expand_range", range);
 }
 
+bool ApplicationSettings::getCodeViewModeSingle() const
+{
+	return getValue<bool>("code/view_mode_single", false);
+}
+
+void ApplicationSettings::setCodeViewModeSingle(bool enabled)
+{
+	setValue<bool>("code/view_mode_single", enabled);
+}
+
 std::vector<FilePath> ApplicationSettings::getRecentProjects() const
 {
 	std::vector<FilePath> recentProjects;