Method downwards

src/main/java/fieldbox/boxes/Box.java:304–307

returns direction for downwards (children) (e.g breadthFirst(Box::children))

()

	/**
	 * returns direction for downwards (children) (e.g breadthFirst(Box::children))
	 */
	@HiddenInAutocomplete
	public Function<Box, Collection<Box>> downwards() {
		return Box::_children;
	}