Add MCE views for audio and video shortcodes. When the shortcode does not contain a source that supports native playback, just show the filename.

* Remove the audio/video shortcode parsing from the `wpgallery` plugin.
* Make `mce-view` a dependency of `media-audiovideo`
* Introduce `wp.mce.video`, `wp.mce.audio`, `wp.mce.media`, and `wp.mce.media.View`
* Rename `wp.media.audio|video.shortcode()` to `wp.media.audio|video.update()` since it is called on Update and returns a `wp.shortcode` object now.
* In `wp.mce.View.render()`, fire a `ready` event when the placeholder is being parsed and pass the current node to the event handler.

See #27389, #27437.



git-svn-id: https://develop.svn.wordpress.org/trunk@27615 602fd350-edb4-49c9-b593-d223f7449a82
Bump the version for TinyMCE's stylesheet.

See [27615].



git-svn-id: https://develop.svn.wordpress.org/trunk@27616 602fd350-edb4-49c9-b593-d223f7449a82