WooCommerce Deposits 2.2.8

* Feature - Introduce a new action hook that fires immediately after the props for new scheduled order are set.
* Fix - Remove "Add Plan" button.
* Enhancement - New filter introduced to determine if email notification should be sent for Invoice Remaining Balance.
* Fix - Prevent duplicated stock reduce during follow up orders for products with Managed Stock enabled.
* Tweak - WooCommerce 3.8 minimum compatibility.
* Fix - Update composer.json to include the /languages folder in the release.
* Fix - Compatibility issues with membership discounts.
* Fix - Import/Export support for _wc_deposit_payment_plans.

* Feature - Add a convenient way for customers to navigate between original orders and its related scheduled orders. PR#388
* Fix - Fix issues with cart totals when the cart contains a subscription and a deposit product. PR#374
* Fix - Send email alerts to customer and admin when payments are made on scheduled orders. PR#387

* Fix - Correctly calculate discounts when coupons are used for orders containing tax inclusive discount products.
* Fix - Don't allow payment gateways that are disabled for deposits to be used to pay for future payments.
* Dev - Update jQuery 3.0 deprecations.