WooCommerce WishLists 2.3.3

* Update: Correct spelling of filter, wc_wishlists_udpate_list_args
* Update: Added woocommerce_add_to_cart_validation before an item is added to the cart.
* Update: Added check for Google trying to follow the add to wishlist link.
* Update: If for some reason an invalid product ID is passed to the wishlist handler, it will now just ignore it.
* Update: Remove old WC extension update functions.
* Fix: Send the product URL through the woocommerce_get_product_permalink filter in the view template.

* Fix: Check if the product is available before calling methods on it. Fixes issues with Divi incorrectly causing WooCommerce actions to fire on non product pages.
* Update: If the filtered template hook is empty do not add the wishlist form.
* Update: Use $_REQUEST when editing the list for checking for the list id.

* Check product exists before attempting to call functions on it.
* Update: WC and WP Updates.
* Fix: Change the $.fn.modal to $.fn.wl_modal so it does not conflict with other jquery modal plugins.