Teams for Woocommerce Memberships 1.7.6

* Misc - Add compatibility for WooCommerce High Performance Order Storage (HPOS)

* Fix - Replace deprecated `is_ajax()` function calls with `wp_doing_ajax()`
* Misc - Require WooCommerce 3.9.4 or newer

* Fix - Correctly render the my-team-no-members template when loading the Team Members table for a team with no members