SONATA-367 - Fix every prices calculated in basket, order and invoice

Fix units tests

Add unit prices in order & invoice elements

Fix units tests

Feedbacks

Rename

Fix name

Add VAT

Update translations

Add product

Add PriceComputableInterface to BaseProduct and BasketElement

Fix

Remove $precision parameter and define it in PriceBundle

Add doc

Fix bcscale

Fix

Fix

Fix units tests