[IMP] sale, website_sale : improve emails sent on confirmation and payment

Purpose of this commit is to send the order and payment details email to user
when they purchase any order from ecommerce or when do the payment from
portal. Currently it was sending quotation mail when the payment is processed.
Now it send an email for quotation, and one email for sale confirmation that
may contain more detailed content if coming from website (eCommerce).

In sale

 * create new confirmation template and set the default template in sales
   settings;
 * when payment enabled in sales settings then display template option to send
   default confirmation mail when payment is processed or order signed;
 * add tool method to find the right template to use when sending the
   quotation / SO by email;
 * ensure email is sent everytime SO is confirmed;

In website_sale

 * add option in website setting in order, to set the confirmation mail
   template;
 * ensure email is sent everytime SO is confirmed;

Related to task ID 1873634
Linked to PR #28781

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