WooCommerce Account Funds 3.2.1

* Fix - Error when opening admin page of coopons.
* Tweak - Add new email settings and templates when funds are increased via admin page.

* Fix - Unable to add funds via top-up when using WooCommerce 3.0.
* Fix - Amount funded in recent deposits display zero.
* Fix - Error in my account funds page.
* Fix - Added migration routine to store top-up related information in order item meta.

* Fix - When partially paying with a gateway, the full amount is passed instead of remaining amount.
* Fix - Subscriptions recurring payments applied but status not set to active after payment.
* Fix - Update for WC 3.0 compatibility.