PeerTube-to-Twitch Bridge Viewer per NorthWestWind

This extension is changes PeerTube bridge bot's name on Twitch to the user it's bridging from. This should be used in combination with the PeerTube bridge bridging Twitch bot.

The Twitch bot displays all PeerTube messages under the same account, and that can be quite confusing to viewers. By changing the username of the bot for each message, it should hopefully be more clear which PeerTube user is chatting.