Summary: Ref T6916. Added video to remarkup using D7156 as reference.
Test Plan:
- Viewed video files (MP4, Ogg) in Safari, Chrome, Firefox (some don't work, e.g., OGG in Safari, but nothing we can really do about that).
- Used `alt`.
- Used `autoplay`.
- Used `loop`.
- Used `media=audio`.
- Viewed file detail page.
Reviewers: nateguchi2, chad, #blessed_reviewers
Reviewed By: chad, #blessed_reviewers
Subscribers: asherkin, ivo, joshuaspence, Korvin, epriestley
Tags: #remarkup
Maniphest Tasks: T6916
Differential Revision: https://secure.phabricator.com/D11297
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