Calling load_yaml_config_file(config_path) causes issues when trying to
load from multiple files in a directory since config_path is modified in
the closure.
This also separates the parse code block into its own function so that
there is no restriction that the object be a dictionary for included
files. This means that scalars, lists, etc. can also be stored in
separate files -- for example, the scene component expects a list.
Allows including other files in the main configuration.yaml file. With
this functionality, passwords or other sensitive information can be
stored in a separate file from the main configuration.
Paulus Schoutsen
Andrew Thigpen