Bump to `2.14.0` - fixes issues related to `m4a` files.

Fixes #27570.


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git-svn-id: http://core.svn.wordpress.org/trunk@27645 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When creating a new playlist, we don't know from the model what "type" it is right away (there is no longer a `video-playlist` shortcode) - we need to check the controller's library's prop for `type` when deciding what settings to display in the modal.

See #27535.


Built from https://develop.svn.wordpress.org/trunk@27812


git-svn-id: http://core.svn.wordpress.org/trunk@27646 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Return the default mime icon for playlist items that don't have a featured image in `wp_prepare_attachment_for_js()`.

See [27640].


Built from https://develop.svn.wordpress.org/trunk@27813


git-svn-id: http://core.svn.wordpress.org/trunk@27647 1a063a9b-81f0-0310-95a4-ce76da25c4cd