Make media grid text fields (data) toggle-able. Checking/unchecking is saved in user settings cookie.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@28995


git-svn-id: http://core.svn.wordpress.org/trunk@28783 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: for audio and video files with covers, show that instead of the icon. The filename is still present with the extension to identify the type.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@28996


git-svn-id: http://core.svn.wordpress.org/trunk@28784 1a063a9b-81f0-0310-95a4-ce76da25c4cd