Give - Recurring Donations 2.7.0

* New: Added a new email template tag `{subscriptions_link}` that takes donors to their subscription history.
* Fix: Links to subscription details from receipts now will never expire or require a login. This is to improve the donor experience and not require them to confirm their email or login.

* Fix: Adjusted the column types for recurring amounts to resolve decimal amount formatting when using non-US separators.
* Fix: Removed code preventing Mollie annual (yearly) donations because the gateway now supports it.

* New: There is now a new admin email that can be enabled to notify when renewals are successfully processed.
* New: We also added a new admin email to notify when subscriptions have been cancelled.
* Tweak: Improved the donation listing page to be more performant when Recurring Donations is active.
* Fix: Ensure donation renewal frequencies are translatable.
* Fix: We improved the search within the subscriptions listing page within wp-admin to return more accurate results.