In a nutshell, this commit
- moves payment_order_type (payment|debit) to account_banking_payment_export
- makes payment_order_type visible in account_direct_debit
- make direct_debit depend on account_banking_payment_export
- introduce account_banking_payment_export module with all features from account_banking_payment that do not involve changing the payment order workflow or depend on bank statement changes
- account_banking_payment_export does not depend on account_banking
- account_banking_payment is consequently stripped of above features
- account_banking_sepa_credit_transfer depend on account_banking_payment_export and is compatible with the default payment order workflow
