function getCommandLineParameter (key, defaultValue = undefined) {
			const index = process.argv.indexOf(`--${key}`);
			const value = index > -1 ? process.argv[index + 1] : undefined;
			return value !== undefined ? String(value) : defaultValue;
		}
Get command line parameters
Assumes that a cmdline parameter is defined with `--key [value]`
@param {string} key key to look for at the command line
@param {string} defaultValue value if no key is given at the command line
@returns {string} the value of the parameter