Added more country-based tests, added new error type
The error type `NOT_SUPPORTED_COUNTRY_CODE_ERROR` has been added for the
IBANs from unsupported countries, for which we don't have defined a
format. We will not check anymore if a country code against the Intl
component.
The tests have been completed with more tests for each contry we have
formats defined.
The 4 character length check and the case check has been removed. The message code constants
`TOO_SHORT_ERROR` and `INVALID_CASE_ERROR` has been deprecated