WooCommerce Deposits 2.2.8

* Fix - Allow forced Deposits products to be added to cart via AJAX.
* Fix - Increase coupon usage when deposit is paid.
* Fix - Payment plans were hard-coded to use 100 percent rather than amount set.
* Tweak - Only show the Scheduled Orders menu item if customer has scheduled orders.

* Fix - Deferred tax for payment plans calculated incorrectly.
* Fix - Pass the unformatted tax amount to display in order tax totals.
* Fix - Prevent deferred tax from being subtracted twice in an order.
* Fix - Save updated totals and taxes when creating new order.
* Tweak - Use WooCommerce styles for displaying help tip and description.
* Tweak - Remove legacy code.
* Tweak - WC 4.0 compatibility.

* Fix - Payment plan not working with coupons and taxes.