Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  2da4c4acfeae3f2a6fb41b57abf7af900d471841

Refactor panel-related things into another class

mmv.lightboxinterface was getting way too clunky.

https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/124

Change-Id: Ie3a604b532ee853f9df673cc4d38c2c7594bdefa