Very large gifs should be shown as previews

I understand @riking’s concern, but in this case it is totally safe to whitelist autoplay+loop for oneboxed Gifly GIF-videos as they do not have sound.

Note that Imgur also does not support sound, but as a precaution oneboxed GIF-videos are muted by default:

<video id="video" autoplay="autoplay" muted="muted" preload="auto" loop="loop" poster="//i.imgur.com/YfPjduYh.jpg">
    (...)
</video>

We should simply do the same for Gfycat.

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