Teams for Woocommerce Memberships 1.7.4

* Fix - Ensure that guests invited as team managers have their designated role assigned when they register to the site while responding to the invitation
* Fix - Display a Registration Link when adding members to teams that have unlimited seats
* Fix - Improve compatibility with Twenty Twenty and Twenty Twenty-One WordPress themes

* Fix - Fix fatal error when adding members

* Misc - Add compatibility for WooCommerce 4.7
* Misc - Require PHP 7.0 or newer