Unifying media controls and supporting playlists in the editor:

* Support a `caption` attribute for audio and video shortcodes
* In `wp.media.audio|video`, rename `update` to `shortcode` to allow these models to share the same mixins as `wp.media.collection` subclasses
* When sending an audio or video shortcode to the editor, create a default caption if the user hasn't entered one. This currently only displays in the editor, not on the front end. Captions aren't tied to a specific attachment here because external sources are supported.
* In the `wp.mce.media` mixin, in the `edit` method, read `attr` instead of `data` when attempting to parse the encoded shortcode. `data` does not automatically update when the attribute changes. This was a blessing to debug.
* Add `wp.mce.media.PlaylistView` to support playlist views in TinyMCE
* Expose `WPPlaylistView` to global scope and suppress auto-parsing of playlist nodes when in the admin. Allow `WPPlaylistView` to be passed `metadata` on creation instead of requiring a JSON blob to be parsed.
* Remove all of the playlist logic from the `wpgallery` TinyMCE plugin.
* In `wp_prepare_attachment_for_js()` return more data for audio/video so that playlists can have parity in the admin/front end.

See #27320.


Built from https://develop.svn.wordpress.org/trunk@27640


git-svn-id: http://core.svn.wordpress.org/trunk@27483 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: improved gallery styles in visual editor, props celloexpressions. Fixes #27462.
Built from https://develop.svn.wordpress.org/trunk@27641


git-svn-id: http://core.svn.wordpress.org/trunk@27484 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add JSDoc blocks to `media-audiovideo.js`.

See #27016.


Built from https://develop.svn.wordpress.org/trunk@27642


git-svn-id: http://core.svn.wordpress.org/trunk@27485 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fixes for `jshint`

Built from https://develop.svn.wordpress.org/trunk@27643


git-svn-id: http://core.svn.wordpress.org/trunk@27486 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editing image file: properly refresh the view after restoring the original image or rescaling the image. Props gcorne, see #21811
Built from https://develop.svn.wordpress.org/trunk@27644


git-svn-id: http://core.svn.wordpress.org/trunk@27487 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Merge two strings. see #27320, #27453.

Built from https://develop.svn.wordpress.org/trunk@27645


git-svn-id: http://core.svn.wordpress.org/trunk@27488 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add context to 'Browse' (themes). see #27055, #27453.

Built from https://develop.svn.wordpress.org/trunk@27646


git-svn-id: http://core.svn.wordpress.org/trunk@27489 1a063a9b-81f0-0310-95a4-ce76da25c4cd