logger :: Logger :: default_formatter=
By default no formatter is used.
See DefaultFormatter.
	# Formatter used to format messages before outputting them
	#
	# By default no formatter is used.
	#
	# See `DefaultFormatter`.
	var default_formatter: nullable Formatter = null is optional, writable
					lib/logger/logger.nit:151,2--156,71
				
	redef var default_formatter = new PopFormatter(no_color) is optional
					lib/popcorn/pop_logging.nit:40,2--69