docs: public static void writeConfiguration(Configuration cfg, File file) throws IOException {
  		try (FileWriter fwrt = new FileWriter(file);
  			PrintWriter out = new PrintWriter(fwrt)) {
  			for (String key : cfg.keySet()) {
  				String value = cfg.getString(key, null);
  				out.print(key);
  				out.print(": ");
  				out.println(value);
  			}
  		}
  	}