Removed theme editor, moved multisite menu into normal wp-admin/menu.php

Simplifying the code. No need for theme editor, that just causes grief,
so that's gone. Removed all the unneeded code in
wp-admin/network/menu.php and added the code into wp-admin/menu.php.
Have all your ducks in a row.  Removed formatting for capital_P_dangit.
Added the beginning of commerce integration.