Search Customers by their billing address

We've fixed an issue where sometimes in the Customers list you could see an address for a Customer, but if you searched for that address they would not appear in the search results.

In addition, we now ensure that the first Address associated with a Customer is considered their billing address across the whole platform. Previously Customers created through import from Xero, Quickbooks, or an affiliate lead provider would not have any address marked as a billing address, making them difficult to search for.