Audio/Video media modal scripts should not depend on mce-view.js

[gcorne]

Since the media modal can be used in various scenarios outside of standard post editing, media-audiovideo.js shouldn't depend on mce-view.js. Instead the mce views that are registered should either be registered in mce-view.js or in a separate file.

[wonderboymusic]

27509.diff​ is a first attempt - gonna think about this some more

[wonderboymusic]

In 27733:

Don't make mce-view a dependency for media-audiovideo. Make media-audiovideo and wp-playlist dependencies for mce-view and only enqueue mce-view in the admin in wp_enqueue_media(). MCE views don't need to be included when media is loaded on the front end.

Fixes #27509.

[wonderboymusic]

In 27734:

Always localize mediaelement when passing settings to the page via JSON. wp-mediaelement only gets triggered for audio and video shortcodes, playlists need the path passed to the page as well, as they don't enqueue wp-mediaelement.

See #27509.