Update existing mjpeg-player to play media loaded using modified hls.js code.

[Trek Hopton]

The existing player plays MJPEG from file.

With the addition on m3u playlist support, we need to:

• add a URL input field to the HTML to load playlists
• adapt the player to receive live, continuous data
• trigger m3u playlist loading process when input is detected

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[Trek Hopton]

Resolved in PR #342