scanListValue looks for the value associated with an option.

scanOption looks for either an "option" or "list" keyword (with name and value), or it falls back to scanStart.

scanOptionName looks for a name of a string option.

scanOptionValue looks for the value associated with an option.

scanPackage looks for a package name.

scanSection looks for a section type and optional a name.

scanStart looks for a "package" or "config" item.