* Change coupons sum to distinct coupon count in REST API
* Hook up unique coupon count to orders summary numbers
* Add coupons count to order segmenting
* Add coupons count to expected stats in order test and revenue tests
* 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
* Switched Average order value calculation from gross to net revenue.
* Updated tests to reflect switch of average order value from gross to net revenue.
* Move TableSummary below pagination
* Add summary to order table
* Add new and returning customers
* Add product to totals in API
* Use get_var instead of get_results for unique products
* Change table summary styling
Remove slashes and increase padding between items based on discussion with @LevinMedia
Change margin to padding to overlap table shadow when pagination is not present.
* Fix wp_posts prefix and move to separate fxn
* Change new/returning customer column types to intval
* Add new/returning customer data to tests and fix formatting