Problem
This Programming Project requires you to first complete Programming Project 7 from Chapter 5, which is an implementation of a Pizza class. Add an Order class that contains a private vector of type Pizza. This class represents a customer's entire order, where the order may consist of multiple pizzas. Include appropriate functions so that a user of the Order class can add pizzas to the order (type is deep dish, hand tossed, or pan; size is small, medium, or large; number of pepperoni or cheese toppings). You can use constants to represent the type and size. Also write a function that outputs everything in the order along with the total price. Write a suitable test program that adds multiple pizzas to an order(s).