Feature: Chat images

[Smidqe]

MERGE ONLY AFTER #84

Fixes #33

Aliases:
/img [image url]
/image [image url]

Will suppress the message if the link is not a valid or supported image.

[Atte]

The img should probably call scrollBuffersToBottom() when the load event fires. Otherwise the chat buffer might not scroll properly, since the "message received" scroll happens before the image loads, and thus before the image has its final height.

There's also currently a /video filter, which creates a <video autoplay loop muted playsinline src="url" referrerpolicy="no-referrer" alt="Loading video..." onload="scrollBuffersToBottom()" /> instead of an <img ...>. Maybe the /img command coudld use the file extension to decide when to do that instead, so that the commands could be combined? Would be extra useful for weird stuff like ".gifv".

[Smidqe]

Would a combined /media command be better then, and determine the message type (image, video) on server side?

[Atte]

Nah /img is fine as the command, since that's what people are already used to. /video and /media could be extra aliases for when people are too drunk to remember how to tube.

[Smidqe]

Oh right, forgot the aliases