The YamlObject class was designed to represent data parsed from YAML
files. It is outgrowing the initial needs. Move it to a separate file to
prepare for a rename.
Most files that include yaml_parser.h only need access to a YamlObject.
Switch them to yaml_object.h. pipeline_base.cpp was including
yaml_parser.h indirectly through pipeline_base.h, include it directly
now.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
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