Re: [w3c/payment-request] Should PaymentItems have a type? (#163)

The ideal solution is probably too big a change at this stage (making `PaymentDetailsInit.total` a `sequence<PaymentItem>`) so perhaps the following would suffice:

```idl
dictionary PaymentItem {
    required DOMString             label;
    required PaymentCurrencyAmount amount;
    boolean                        pending = false;
    boolean                        subTotal = false;
};
```

If `subTotal` is `true` this indicates to the browser that the item should be grouped with the total.

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