ui: Fixes and improvements for bookmarks

* moved bookmark buttons behind search bar
* suggest qualified name when creating, file name for files
* fixed bug when updating bookmark category
* changed comment toggle arrow
* changed edit and delete icons
* fixed undo for edge bookmarks
* keep categories always alphabetical regardless of subsorting
* keep category expansion state when opening and closing browser
* removed QtBookmarkBar, moved logic into QtBookmarkView
* added bookmarks Menu with shortcuts
	Ctrl + D: Create Bookmark
	Ctrl + B: Bookmark Manager

src/lib_gui/qt/window/QtMainWindow.h

@@ -123,6 +123,9 @@ public slots:
 private slots:
 	void toggleShowDockWidgetTitleBars();
 
+	void showBookmarkCreator();
+	void showBookmarkBrowser();
+
 private:
 	struct DockWidget
 	{
@@ -135,6 +138,7 @@ private:
     void setupEditMenu();
 	void setupProjectMenu();
 	void setupViewMenu();
+	void setupBookmarksMenu();
 	void setupHelpMenu();
 
 	void setTrialActionsEnabled(bool enabled);