Game breaks if a user disconnects mid-game

[gitchly]

Upon detecting another user leaving the room, clients will immediately delete the user data, which causes most game logic to break due to the missing user object.

// Remove user from room
SOCKET.on('userLeave', (userID) => {
	// Clear user data
	console.log(getName(userID), "disconnected");
	delete USERS[userID];
	updatePlayerList();
});

This crashes the client-side JS, and has the potential to crash the server too. Code-proofing will also need to be implemented to ensure this doesn't happen.

I recommend not deleting USERS[userID], but instead tagging it as a disconnected user. This would also help with issue #2.