[IMP] website_sale: imprrove / refactor some templates
[IMP] website_sale: imprrove / refactor some templates

Make bill_to generic, and callable
Use Json synthax and not Dict synthax (even if it was compatible) fot t-field-option
Replace deprecated t-field-options by t-options

ygol/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,ygol/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo