Specify the command line option name to get. Add a '-' (hyphen) at the beginning (eg '-nosplash').
戻り値
If a command line option is specified, its value is returned, otherwise void is returned.
説明
Command line options must be passed to Kirikiri in the following format: -name=value
or -name value is returned as the value in the former case, and 'yes' is returned as the value in the latter case.