Escape playlist data in templates.

props wonderboymusic.
fixes #27710.


git-svn-id: https://develop.svn.wordpress.org/trunk@28050 602fd350-edb4-49c9-b593-d223f7449a82
Don't show featured images for image attachments. Remove abstractions for now.

fixes #27673.


git-svn-id: https://develop.svn.wordpress.org/trunk@28051 602fd350-edb4-49c9-b593-d223f7449a82