[quotation, ecommerce] show details of the carts in the confirmation email template

- Task: https://www.odoo.com/web#id=9421&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.kmI7xByKs7Krvusa
This will break in email template editor (install `mass_mailing` module). In fact, web browsers will not allow you to add this kind of lines inside a `<table>` tag. The only countermeasure you can develop is to generate a table for each line, with border size == 0 and fixed widths for the columns.