Allow an exception for twitch.tv links
Some Channels don't allow links to be posted in the chat, including twitch.tv links.
I believe this is mostly to prevent spam and unwanted advertisement.
An exception for twitch.tv links wouldn't hurt so we can post twitch-related content (maybe with a Option for Streamer's own Channel-related content only).
..This way I can share a Clipped stream highlight other than Reddit.