JS code managing transaction creation through acquirer 'Pay Now' form
button is improved in order to be less website-sale dependant. It now
takes parameters for access token and URL to call in Json. Class used
to bind JS is now o_payment_acquirer_button in order to be more generic.
eCommerce module is updated accordingly. Future commits will probably
make Online Quote (website_quote) use it.
Move sale and payment bridge code into its own module. This commit mainly
moves (and reorganizes without changes) code from website_sale related
to payment and SO confirmation.
Only change is that payment_acquirer_id field on sale order is now a
related on transaction.acquirer_id . Indeed in website_sale and
website_quote both values were written but only managing transactions
and getting its acquirer is more efficient and ensure values are coherent.
JS part controlling payment form management is moved directly into
payment to reuse later on in future commits. Probably.
The installation of a new acquirer was a bit complicated : from settings,
check the acquirer, then apply (install the module) then list view of
acquirer and finally edit it in form view.
This needed to be simplified. The payment acquirers are pre-filled
in payment. From the kanban view an `Install` button installs and
redirects to the form field.