Gravity Forms Stripe Addon 5.8.0

- Added compatibility with the upcoming Compact View feature of Gravity Forms, displaying field messages on the sidebar.
- Updated the theme framework variables to be compatible with Gravity Forms 2.8.
- Fixed an issue with the Stripe Card field that displays a "return_url must be specified" error message in certain situations.
- Fixed an issue that causes 3DS transactions to fail if the associated feed is for Subscriptions.
- Fixed an issue that halts form submissions on certain situations if 3DS validation is required.
- Fixed an issue where using the Payment Element in conjunction with conditional logic can result in incomplete entry data.
- Fixed an issue where a "The link you followed has expired" error occurs on submission when the "Require user to be logged in" form setting is enabled.

- Fixed an issue with the Stripe Card field that displays a "return_url must be specified" error messages on certain situations.

- Added the [gform_stripe_payment_element_initial_payment_information](https://docs.gravityforms.com/gform_stripe_payment_element_initial_payment_information/) filter to override the initial payment information used to render the payment element.
- Fixed an issue where a payment method can't be attached to a customer when the Payment Element is enabled.
- Fixed an issue where the gform_stripe_elements_style filter is not being correctly applied.
- Fixed an issue that prevents the gform_stripe_webhook filter from being fired in some cases.
- Fixed an issue where using a list field with columns enabled on a form with the Stripe Payment Element can cause a fatal error.
- Fixed an issue where list field values are not saved to the entry when the Payment Element is enabled.
- Fixed an issue where the Payment Element doesn't work on ajax-enabled forms.