Give - Recurring Donations 2.7.0

* Fix: Resolved an issue with Stripe payment gateway renewal dates not being properly being set when a new renewal is processed via Stripe's new API. The renewal dates for all Stripe gateway offerings will now reflect properly in your subscriptions dashboard within wp-admin.

* Tweak: Adjusted how the Giv Core Subscription API endpoint returns results so that amounts are formatted properly and also includes the donation form title and currency code. This is useful for Zapier and other API integrations.

* Fix: Stripe fix to ensure existing donors who process a recurring donation with a new card or a new donor who use their card first time within the Stripe Checkout modal don't receive a "No Such Source" error.