* Add product attribute filter to Orders report config.
* Add attribute args to Orders report controller.
* Include attribute filters in orders report query.
* Add attribute args to Orders Stats report controller.
* Include attribute filters in orders report stats query.
* Add test for product attribute filter in orders report.
* Add tests for invalid parameter values.
* Add tests for product attribute filter in order stats endpoint.
* Fix tests for PHP 5.6 and WC 3.8.x.
* Don't require package tag or file comment inside src
* Removed package tag from files inside src
* Fixed tests directory in phpcs.xml.dist
* Fixed usage of package tag
* Fixed new classes
* Fixed coding standards
* Fixed coding standards in tests
* Display order number on reports, and add to API response.
* Add method for getting order number, avoiding loading the data store if no filter is attached.
* Rename orders controllers and data store to order stats
* Add orders data store and controller
* Add coupon, product, and status filters
* Add customer type query filter
* Add extended info for products and categories
* Bump API namespace to v4
* Add missing schema properties
* Set default customer_type and extended_info params
* Add orders endpoint tests
* Only use one JOIN if both excluded and included queries are used
* Optimize query calls to get product and category data
* Split product and category fetch and limit to product_cat taxonomy