Determines the person type based on the input personType.

If the input personType is not specified and icoRc is specified, the personType is determined from icoRc. The following rules apply:

• If the icoRc string contains only digits and its length is 8 characters, then it is considered as a CRN.
• If the icoRc string contains only digits and its length is 9 characters and the first two digits form a number smaller than 54, then it is considered as a birth number.
• If the icoRc string contains only digits and its length is 10 characters and the first two digits form a number greater than 53, then it is considered as a birth number.
• If the icoRc contains six digits followed by either a '\' or '/' and then by 3 digits and the first two digits form a number smaller than 54, then it is considered as a birth number.
• If the icoRc contains six digits followed by either a '\' or '/' and then by 4 digits and the first two digits form a number greater than 53, then it is considered as a birth number.
• If the icoRc is a date in some of the supported forms: [d]d<x>[m]m<x>yy, [d]d<x>[m]m<x>yyyy where <x> could be '.' , '-' , '/' or '\' then it is considered as a birth number.
• In any other case the icoRc string is considered to be neither birth number nor CRN.

If the icoRc string is considered as a CRN, the person type will be determined as personTypeWhenLegal, if the icoRc string is considered as a birth number, the person type will be determined as personTypeWhenNatural.