Menu Customizer: mark all menu items as uncloned (item control is an original, direct changes would go live) after changes are saved & published.

git-svn-id: https://plugins.svn.wordpress.org/menu-customizer/trunk@949919 b8457f37-d9ea-0310-8a92-e5e31aec5664
Menu Customizer: outline function for previewing menus. Next step is to dig into menus and find an appropriate place to hook into and replace the menu items found for the menu with these ids.

git-svn-id: https://plugins.svn.wordpress.org/menu-customizer/trunk@949920 b8457f37-d9ea-0310-8a92-e5e31aec5664