WooCommerce Follow Ups Emails 4.9.51

* Fix: Missing email icon on Follow-ups tab on the edit product page.
* Fix: Subscriptions "after failed renewal payment" email not scheduled.
* Fix: Exporting Subscriber Mailing List says no subscribers found.
* Fix: Wrong scheduled date subscriptions related.
* Fix: Random emails sent out on cancelling a subscription.
* Fix: Deprecated function warning in email preview.
* Fix: Email variable {order_pay_url} should link towards the renewal order with certain Subscription triggers.
* Fix: Make mailing list subscription for user more friendly.
* Fix: Make compatible with Memberships 1.11.0.
* Fix: Warnings in the Templates section.
* Update: New main dashboard
* Update: Various copy edits

* Update: Export/erasure hooks added.
* Fix: Product variations don't trigger "after added to cart" emails.
* Update: Removal of unused custom DB tables.
* Fix: Reduced db indexes to 191 characters from 255 characters.

* Update: Privacy policy notification.
* Update: WC 3.4 compatibility.