Balance waiting players between rooms

[karashiiro]

Since we don't get waiting player counts from the server info packets, we need to balance players added to full rooms when our instances are maxed out, so we don't just reject waiting players. Ideally we'd have a hook or a Lua script installed to give us this information, but failing that, we can just spread waiters evenly across our open containers.

[karashiiro]

See #11, a hook should not be used for this.

[karashiiro]

Actually, this might not matter. If an instance is full, the lobby server won't connect players to it until it is. All that needs to be done here is making a proper queue out of that functionality.

[karashiiro]

There should also be a thing to send whichever packet lets the client know that they're in the queue.

[karashiiro]

This also needs to be cached.