Indent subfolder menu items in mintMenu

Currently mintMenu shows only the first level of the gnome menu, and any items grouped into subfolders are shown without the folder in its parent folder (Wine->Programs shortcuts are shown in Wine). This caused quite a bit of clutter in the menu. Perhaps subfolders can be displayed as a entry in the third column, with items in the folder shown below, slightly indented. Perhaps even a tree view type interface can be used so that folders can be opened at will.