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