Move utils.js (cookie and user setting functions) to wp-includes to enable front-end use.

Make it a dependency of media-views (and therefore media-editor). Move its userSettings JS object from admin-header to being paired with the script in script loader.

see #22730.



git-svn-id: https://core.svn.wordpress.org/trunk@23036 1a063a9b-81f0-0310-95a4-ce76da25c4cd