Add YamlObject::add() functions to add children to a list or dictionary
object. This will be used by the YamlParserContext to replace direct
access to YamlObject member variables to decouple the two classes.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>