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/utility/messaging/type/MessageDisplayBookmarks.h

@@ -14,7 +14,7 @@ public:
 		NODES,
 		EDGES
 	};
-	
+
 	enum BookmarkOrder
 	{
 		NONE = 0,
@@ -30,6 +30,12 @@ public:
 	{
 	}
 
+	MessageDisplayBookmarks()
+		: filter(MessageDisplayBookmarks::BookmarkFilter::ALL)
+		, order(MessageDisplayBookmarks::BookmarkOrder::NONE)
+	{
+	}
+
 	static const std::string getStaticType()
 	{
 		return "MessageDisplayBookmarks";