All Products for WooCommerce Subscriptions 6.0.6

* New - Declared compatibility with the new High-Performance Order Storage

* Update - Added support for adding carts to existing subscriptions via the checkout page.

* Fix - Fixed an issue that prevented carts with one-time purchase products from being added to existing subscriptions.
* Fix - Fixed an issue that prevented plan discounts from applying when adding a cart to an existing subscription.
* Fix - Fixed an issue that prevented Bundle scheme prices from calculating correctly when bundled item discounts applied to Regular product prices