Previously, userid was generated by the "/login" route and passed along.
This commit completely removes the uuid "userid" (and disables the LoginController too and any Jwt check).
"userid" is replaced by the "socket id" of the connection.
So a user is now identified using a socket id, which is unique for a given connection.
- I stocked information user (id, room and position) in socket client.
- I created function to send all information every few 10 milliseconds.
Note : when the front will be available, we must check the performance of back server.
