Add Play button for animated GIF shots

Here's a change that what I would personally find useful.

Add a "play" icon to the shot information for animated GIFs. By default the page would display the first frame from the GIF, and clicking on the button would ajax full GIF from the server and replace the original image with it.

I realize there's a lot of icons that are getting displayed in that very spot already - rebound, "has rebounds", "has attachement(s)" - but I think these are all superficial in a sense that they do not facilitate the browsing experience. Perhaps "has rebounds" is useful, but as far as the other two go - I must be not the only who pays zero attention to them.

In any case, I would love to see a proper support for animated GIFs or some sort of animated medium. A lot of my recent work falls into an interaction and UX domain rather than just perfecting static subpixels. It'd be nice to be able to showcase it properly.

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GIFs are nice because they are Flash-less, codec-less and trivial to support. The drawbacks are that they are not that easy to create, they are limited to 256 colors per frame and WebKit caps their FPS rate. The last one is bothersome, but the cap is not that limiting for practical purposes.