Apply word filtering rules to usernames on player connect

[Gcommer]

Rather than adding much specialized handling I just treat a connect event as a chat message with the player's name in it. This is a bit annoying since it shows up on the site's chat log, but I suppose it could be a good log to protect against users changing their names a lot (in an attempt to hide something offensive). Followups could hide those messages from showing up on the site.

While testing on my server, I realized that automatic actions on chat messages didn't seem to be working at all (maybe I'm missing some setup?). I fixed that here by having chat_usecase listen to chat_repository's WarningChan.

Another new change here is that we kick based off of the server id and player id from the log event instead of doing a lookup by steamid. This is pretty necessary as it's very unlikely we'll have gotten a status update from the server before the connect event... This also fixes an issue where users could avoid auto-kicks for chat messages if they said something offensive very shortly after joining a server.

There's a small loophole, that we don't check usernames continuously... So if an offensive username joins while the gbans server is restarting they'll get to stay in the server.

Fixes #435

[leighmacdonald]

Looks good. I believe your are correct in your assertion that the warning were not firing, so its great you got that working. Will test it out late today when i get a chance.

[leighmacdonald]

Works great, thanks!