Barn2 Media - Easy Digital Downloads EU VAT 1.5.26

* Fix: Removed the "Requires Plugins" section from the plugin header.

* Tweak: VAT rate for Finland has been increased to 25.5%
* Tweak: No longer set session data when not reverse charged or no VAT number is present.
* Tweak: Added a new filter for the `insert_subscription_payment` method.
* Dev: Minor internal changes.
* Dev: Tested up to WP 6.6.1 and EDD 3.3.3

* Fix: fatal error when activating the plugin while EDD is not active.
* Fix: VAT "Billed To" section not visible due to payment key not longer available via global variable.
* Dev: Updated internal libraries.