Create a signaling method based on command-line arguments.

def create_signaling(args):
    """
    Create a signaling method based on command-line arguments.
    """
    if args.signaling == 'tcp-socket':
        return TcpSocketSignaling(args.signaling_host, args.signaling_port)
    elif args.signaling == 'unix-socket':
        return UnixSocketSignaling(args.signaling_path)
    else:
        return CopyAndPasteSignaling()