Matchmaking

Events sent by the client:

queue_join:
Argument:
```
user_id: int
elo: int
```
Add the user to the queue
queue_info:
Argument:
```
None
```
Request information about the queue

Events sent by the server:

`match`

Argument:
Array [ { user_id: str, elo: int }, { user_id: str, elo: int } ]
Send the user_id and elo of the two matched players

queue_info:
Argument:
```
Array [ {...}, {...}, ... ]
```
Send the queue array with useful information about the players in the queue