Move sounds directory
Play sounds from the server instead of the client

- epiphany on pi can't really handle the sounds, so needed to switch
- make GameController an event emitter, handle events in Server
- remove socket server and stats events from GameController constructor
- remove useless function: GameController#updateStatus()
- remove GameController#clientJoined()
- create SoundPlayer
Delete sound sprite
Update request version
Rebuild frontend