:meth:`.WSignalProxyProto.stop_proxying` implementation

def stop_proxying(self, signal_source, *signal_names, weak_ref=False):
		""" :meth:`.WSignalProxyProto.stop_proxying` implementation
		"""
		callback = self.__callback if weak_ref is False else self.__weak_ref_callback
		for signal_name in signal_names:
			signal_source.remove_callback(signal_name, callback)