Cart Tax Calculation Mode

We have introduced the UnitPriceLevel TaxCalculationMode on carts to be able to calculate taxes per unit price and not only per line item as before. The opposite LineItemLevel mode is the default tax calculation mode on the cart so that this new feature does not break any existing application.

• [API] Added taxCalculationMode to Cart and Order. The TaxCalculationMode can be set during creation of the cart or afterwards by the new update action Change TaxCalculationMode. Carts can now be queried by taxCalculationMode.