Load config options from CLI arguments.
Load specified config file and add loaded data to the configuration.
Names of packages and modules to exclude from generated documentation.
Loaded from macroFileNames + default macros; not set on the command-line.
Stores configuration data loaded from command-line or config files.
Note that multiple calls to loadCLI/loadConfigFile are supported; data loaded with earlier calls is overwritten by later calls (e.g. command-line overriding config file), except arrays like macroFileNames/excludes/sourcePaths: successive calls always add to these arrays instead of overwriting them, so e.g. extra modules can be excluded with command-line.