TCP socket accepting new connections

Opened on the first call to accept_clients.

Property definitions

gamnit $ Server :: listening_socket
	# TCP socket accepting new connections
	#
	# Opened on the first call to `accept_clients`.
	var listening_socket: TCPServer is lazy do
		var socket = new TCPServer(port)
		socket.listen 8
		socket.blocking = false
		return socket
	end
lib/gamnit/network/server.nit:59,2--67,4