Finish CartDetailView

[adamrais]

Design and implementation of the cartDetailView

[adamrais]

• added function in modelData convertSizeToString that will give the string for the chosen size of the cupcakes, boba or macarons
• published value for the size of an item will always be the last one chosen (bug)

[adamrais]

CartView should have fields for

• [ ] quantity
• [x] any extra options or size of the item
• [x] price
• [x] name of item and image
• [x] checkout button
• [x] field for total price and taxes
• [ ] tbd