RedSys Gateway | Pasarela Redsys para WooCommerce 25.1.5

* FIX: Fixed the terminal saving issue in one of the processes. It was causing issues with returns through InSite.
* FIX: Fixed an issue with sending COF_TYPE in one of the processes with InSite.

* UPDATE: Improved InSite with authenticators.
* UPDATE: Added more non-english caracters to sanitization.
* UPDATE: Now if the customer language is not in plugin array, the plugin use English language.
* UPDATE: Improved redirection with modal. Now the modal is closed when the customer press cancel bitton in Redsys.
* FIX: Fixed an error when Pay with 1click is not active in InSite.
* FIX: Fixed many Notices and some Warnings.

* FIX: Temp disabled function for hiding Bizum. I have to check what changed in WooCommerce.

* FIX: Fixed an error with Pay button from My account when WooCommerce Subscriptions is not installed.

* FIX: Fixed a function that in some servers can cause a fatal error.

* NEW: Added Scheduled Action to delete expired transients.
* NEW: Added Scheduled Action to delete information related to removed tokens.
* NEW: Added new filter for Bulk Refunds "redsys_refund_filter".
* NEW: Added Redsys integration by iframe with Redsys redirection.
* NEW: Removed support for PHP 5.x
* NEW: Declared compatibility with WordPress 6.2
* NEW: Declared compatibility with WooCommerce 7.3
* NEW: New Constant "REDSYS_LICENSE_SITE_ID" for WordPress Multisite. Default "1".
* UPDATE: Checking Redsys Licence in WordPress Multisite.
* FIX: Two HPOS metas.
* FIX: Customer name send to Bizum.
* FIX: Removed a log code that echo a $_POST.
* FIX: Fixed test mode in MasterPass.

* Fixed Typo in Global function get_last_four()
* Fixed pay with 1click in redirection.