[MERGE][IMP] sale: improve usability of down payments

Task #1908673

Purpose
=======

The "invoice" modal is too complex to use for new users and has a lot of useless options for
the most simple use cases.

The goal here is to remove 2 options of the 'advance_payment_method' field:
* Invoiceable lines
* Invoiceable lines (deduct down payments)

And combine them into a new one: "Standard invoice".

If there are any down payments to deduct, another checkbox field appears under this
one: "Deduct down payments".

This keeps all the invoicing features while simplifying the modal.

Spec
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* Remove "invoiceable lines, deduct down payment" and replace by a checkbox
  (checked by default, only visible if down payments to deduct)
* Rename "Invoiceable lines" into "Standard invoice"
* tooltip on radio buttons: A standard invoice is issued with all the order lines ready for invoicing,
  according to their invoicing policy (based on ordered quantity or on delivered quantity).

closes odoo/odoo#29978

0 files changed, 0 insertions, 0 deletions