Clean up rooms / players once a player is disconnected

[delphinemillet]

To reproduce:

• go online
• create a room
• copy the url
• remove text from /room to the end from the url
• paste the copied url
  (after 2 attempts)
  
• leave the room
• you can join it again

[fabienjuif]

I don't reproduce or I didn't understand the issue.
Could you try next time I publish the game?

[fabienjuif]

I just published a new version, can you try to reproduce it?

[delphinemillet]

I can reproduce.
Steps:

• go online
• create a room
• copy the url
• remove text after .org from url and press Enter
• paste the copied url

[fabienjuif]

Ok, this is not the "same player".
This is another player (another id), with same name.

What I didn't have yet, is user disconnection.
There is no event (server side) attached to the client socket to catch its disconnection.

• This issue is more about cleaning rooms/players/game on disconnection so I let it open.
• This issue can be fixed once this one is done: memory leak / socket disconnected #11