Menu Customizer: add a clone argument to menu_customizer_update_menu_item(), which creates a copy of the original item with the new data instead of updating the original item. Support default item status handling.

git-svn-id: https://plugins.svn.wordpress.org/menu-customizer/trunk@945832 b8457f37-d9ea-0310-8a92-e5e31aec5664