Deal with channel moderation for Twitch chat provider

[dori4n]

It might be sensible to remove messages from users that have been timed out or banned, or messages that have been deleted individually from chat by a moderator.

Depending on the content, and because even moderators can make mistakes, maybe a facility to restore some could be helpful, too (probably not a high priority). Channel bans and unbans are easy enough to deal with. Timeouts are the same event, but with a timestamp saying when it expires. Finding out if a user was globally banned/suspended sadly requires subscribing to channel.update on EventSub for each user, prior to this happening and checking /helix/users if you get a "user does not exist" response whenever you receive such an update event, which I can't say is ideal. Detecting a global unban is even worse, because only polling /helix/users will get you that...

[csharpfritz]

Not a bad idea.. let's target for Milestone 3 where we will start to automate actions like this