Complete refund

- Message transmition :
Added handlers file for client and server. Listenners, receivers,
senders for all messages types. Messages types are now in a shared file.
Transmition can now use bison instead of json.
- Client :
Added some animations and improved design. New character pane is now
fully implemented. Inventory pane html/css is implemented. Logout button
implementation.
- Sevrer :
Corrections on queue leaving, lobby and ready check. Logout handling.
Modifications on player and character mongoose models.
- Misc :
Added a .bat file to launch the server easily.