Support oEmbed matching for YouTube playlist URLs.
 
Fixes #28125.

Built from https://develop.svn.wordpress.org/trunk@28552


git-svn-id: http://core.svn.wordpress.org/trunk@28378 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix parsing in `wp_match_mime_types()` to allow some mime-types with `+` in them to appear in the list of filter links shown above the list table on `upload.php`.	

Props _duck.
Fixes #20672.


Built from https://develop.svn.wordpress.org/trunk@28553


git-svn-id: http://core.svn.wordpress.org/trunk@28379 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add Issuu to list of whitelisted oEmbed providers.

Props issuu.
Fixes #28312.


Built from https://develop.svn.wordpress.org/trunk@28554


git-svn-id: http://core.svn.wordpress.org/trunk@28380 1a063a9b-81f0-0310-95a4-ce76da25c4cd