* Add type argument to getSetting
* Convert prepareAddressFields to TypeScript
* Add State and Country Input prop types
* Type country input
* Type state input
* Convert AddressForm to TypeScript
* Add SHIPPING_COUNTRIES, ALLOWED_COUNTRIES (and states) to constants.ts
* Add return types to components
* Remove shipping-country-input JS file
* Fix type of CountryInputWithCountriesProps
* Use type argument in constants.ts
* Remove unnecessary braces on onChange function
* Use correct case for allowedCountries
Sam Seay
Thomas Roberts