Currencies: Support optional grouping, decimal data, and pattern elements

Ref: similar issue than reported in https://github.com/tc39/ecma402/issues/241

```js
Globalize("pt-PT").formatCurrency(1, "PTE");
> "1,00 ​"
```

[UTS#35](http://www.unicode.org/reports/tr35/tr35-numbers.html#Currencies) says:

> Currencies can also contain optional grouping, decimal data, and pattern elements. This data is inherited from the in the same locale data (if not present in the chain up to root), so only the differing data will be present. See the main document Section 4.1 Multiple Inheritance.

Example: https://github.com/unicode-cldr/cldr-numbers-full/blob/master/main/pt-PT/currencies.json#L1303-L1310