WooCommerce Royal Mail / Royal Mail Shipping Method for WooCommerce 4.0.4

* Add - "Available on" display to indicate the rates availability.
* Update - Update online rate pricing based on July 2024 rates.
* Tweak - WordPress 6.6 Compatibility.

* Update - Update pricing based on April 2024 rates.

* Fix - WordPress Coding Standards.

Update - Update pricing based on January 2024 rates.

Add - Additional compensation option in the settings.

Fix - International rates is not being displayed for printed papers.

* Add - Online rate option in the settings.
* Add - Ignore maximum total cover option in shipping settings.

* Fix - Update pricing based on April 2023 retail rates.

* Fix - Tube package is not included in UK Tracked 24 and 48.

* Fix - Use more unique string for packing and service options element in HTML.