I want to override email template (`/template/mail/order_confirm.tpl`) via my extension, but AbanteCart doesn't allow to do that for some reason. Also I'd like to modify products list, before sending email, but I don't see any `Init` or `Update` hooks inside the Order Model which performs sending (`admin/model/sale/order.php`), so I can't do that. The only `hk_confirm`
hook is called before products list generation, so it doesn't help.