Currently it's impossible to extend the user more menu that shows on
https://en.wikipedia.org/wiki/User:Jdlrobson?useskin=minerva

We should generalize this code so that it uses the menus defined in core and that others can add items provided they associate their menu item with an icon.

Expected changes

• The ordering respects the ordering on desktop (consistency being a goal of this patch) e.g. What links here is now the top link.
• The menu labels should match the desktop menu label equivalents. e.g. User groups is now "Change user groups"
• If a menu item declares an icon, it will now appear in the menu (and didn't before). This was kind of the point of the patch - to allow expansion but nothing has done that yet so there should be no additional items.