Changed endpoints to get the matching shipping methods for a location and an order edit

To streamline the API design, the endpoint to get matching shipping methods for a location and an order edit have been changed. For backwards compatibility the previous format is still in operation, but has now been deprecated.

• [API] Changed the Get ShippingMethods for a Location endpoint.
• [API] Changed the Get ShippingMethods for an OrderEdit endpoint.
• [API] Deprecated the query parameter ?country={country} on /shipping-methods endpoints.
• [API] Deprecated the query parameter ?orderEditId={orderEditId} on /shipping-methods endpoints.