[NEW] 1st draft of account_due_list integration with account_payment_partner

Hi All,

I'm following the mail: [Banking-addons-drivers] banking refactoring next step

As Raphael said, here in Brazil "everything is paid in 10x or so".

We are thinking in a way about meet the needs of account_payment_extension.

This is a 1 hour work scratch about integration of account_due_list and account_payment_partner like as account_payment_extension do with payment.type and account.move.line.

I'll be happy to receive any feedback
Thanks in advance

Sorry for the two incorrects pull requests.
add the field payment mode -> adds the payment mode field