Add support for playing sounds
Summary:
Ref T5369. New HTML5 version without flash dependencies.
This doesn't play any sounds.
Test Plan: Did not play any sounds.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: joshuaspence, epriestley
Maniphest Tasks: T5369
Differential Revision: https://secure.phabricator.com/D9535