feat(external-open): open videos in a looping player

Opening a video from dirvish routed through cj/xdg-open to the OS default handler, which plays it once. I pulled the video extensions into their own cj/video-extensions list and route them through a new cj/open-video-looping, which launches mpv with --loop-file=inf (the player and its args are both customizable) detached, so the video plays on repeat. Audio and office docs still use the OS default handler. The find-file advice already covers dirvish RET, so this applies wherever a video is opened.

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