Additional rabbitmq events

[Askaholic]

We should publish all relevant events to rabbitmq.

• [ ] New "a player logged in" event (skip if there is already an open session from another connection)
• [ ] New "a player logged off" event (only if the last connection is closed)
• [ ] New "player joined game" event
• [ ] New "player left game" event
• [ ] New "game started" event

[Brutus5000]

Is the server capable of handling multiple connections per user right now?

[Askaholic]

If two connections try to log in as the same user then the first one gets kicked.