Use ApostrophusRomanNumeralsConfig to use special symbols from
the Roman era for 500, 1,000; 5,000; 10,000; 50,000; 100,000, and
1,000,000 - these are ⅠↃ, ⅭⅠↃ, ⅠↃↃ, ⅭⅭⅠↃↃ, ⅠↃↃↃ, ⅭⅭⅭⅠↃↃↃ, CCCCIↃↃↃↃ.
Maximum value: 3,999,999.
The RomanNumerals class is used solely to store the default
Roman numerals configuration, RomansNumeralsConfig.common. You
can change this early in runtime so that you don't have to keep
passing the config to every method call. See RomansNumeralsConfig.