Fix the parser answering a ByteArray for encoded photos instead of a String.
Fix the use of double backslashes (\) is not compliant with the vCard 2.1 specification.
Fix usage of backslashes () to escape characters in URLs, which is not compliant with the vCard 3.0 specification. According to RFC 6350, URLs should be encoded properly without needing to escape characters.
Update failing tests to use the vCard 3.0 specification.
Fix test to check that each exported line does not exceed the length of 75 characters.