Feature Request: Export gif story

[SgtPooki]

I would like to see the nerdbot output a video story of a chatroom by collecting (or storing in realtime) all the gifs for a particular chatroom, and then building a video out of them.

If someone gets to this before me (highly likely) please feel free to implement this.. otherwise I will be working on a PR when I find time.

[tvanfosson]

You might want to think about how far back in the history this should go and the potential resource consumption stitching these together.