WooCommerce Conditional Shipping and Payments 1.15.8

* Fix - Fixed saving of 'Exclude Rate IDs' field values with escaped delimiters (%|%).
* Fix - JS error when attempting to set up 'Billing Country' restrictions due to an outdated file commit.

* Fix - Toggle button not working for product-level restrictions.
* Fix - Fatal error in admin area when product-level restrictions are disabled.
* Tweak - Optimized 'edit-product' page load speed on sites with slow shipping configurations.

* Feature - Add states/regions support in 'Billing Country' condition.
* Fix - 'Shipping Postcode' condition did not work in 'Payment Gateway' restrictions when attempting to purchase a synchronized subscription product.
* Fix - Resolved 'get_cart() on null' error triggered under some... pretty interesting circumstances.
* Tweak - Match 'Shipping Postcode' condition when using the 'is not' modifier and and the 'Postcode' checkout field is empty.
* Tweak - Match 'Shipping/Billing Country' condition when using the 'is not' modifier and and the 'State/Region' checkout field is empty.