Fix playback for unmuted videos getting blocked by browser autoplay policies #65
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Fixes bug where unmuted videos could get blocked from playing by browsers' autoplay policies. This issue arose because browser policies require the user to have "interacted" with the page before playing a video with audio, and hover events don't count as a valid interaction; the user needs to click the page.
To get around this issue, if the browser blocks an unmuted video from playing, we will mute the video, attempt to play again,
and then restore sound once the user has clicked on the page.
re #64
Changes