This adds the ability to click on animated images to pause/unpause them. It doesn’t add a visual indicator yet, I’m not sure we need one. cc @awesomerobot
Like other libraries (freezeframe.js, for example), this stores the first frame of the animated image to a canvas (we’re limited to the first frame by browser security when images are stored on a different domain, like a CDN or S3) and displays that when paused.
Also, this will require a rebake to work for previously uploaded images.