Fixes nome_portador length validation
Validade format validation is suficcient (removed others)
Removes redundant validations on autorizar, capturar and url_retorno
Enhances idioma validation messages
Fixes validation of dados_pedido / numero, valor, descricao and soft_descriptor
Validates pedido value only if it's not blank
Makes Bandeiras#operacao to not raise operation_not_supported (allowing to fallback to regular validation)
Makes Bandeiras#operacao resilient to nil errors
Removes presence validation for DadosPortador#numero
Validates numero and codigo_seguranca as regular expressions
Add proper messages for numero/codigo_seguranca validation errors