Add some deleted images to the `$_old_files` array. see [26391], [26395], #26232, #26178.


git-svn-id: https://develop.svn.wordpress.org/trunk@26397 602fd350-edb4-49c9-b593-d223f7449a82
Make sure WP_Editor and Thickbox styles have Dashicons as a dependency, as they can be used on the front. props johnjamesjacoby. fixes #26236.


git-svn-id: https://develop.svn.wordpress.org/trunk@26398 602fd350-edb4-49c9-b593-d223f7449a82