[fix] Sanitised attribute values are no longer forced to lowercase

[fix] Silenced an error when fetching generated product image URLs, caused by some 3rd party plugins

[fix] Compatibility with WC Product Bundles  

[update] Refactored front-end JavaScript to fire on window load instead of document ready. 

[update] Developer update: allow the configurator as a non-zero indexed item in the gallery  

[new] Compatibility with Yith Wishlist  [new] Compatibility with WooCommerce QuickTray by Iconic  [update] Settings framework updates  [update] Update dependencies  [update] Remove `wp-post-image` class from Product Configurator layer images  [fix] Enforced 100% width on Product Configurator images when in a WooThumbs gallery context  [fix] Silenced error caused by terms not having a default featured image  [fix] Fixed class-product where (int) was being compared to a string and failing  [fix] Fixed broken cart image when any of the attribute values has ampersand character(&)  

[new] Conditional layers  [new] Clear cache button  [new] Configurator tab toolbar  [new] JSON loading method for faster image layer updates  [new] Integration with the default WooCommerce gallery  [update] Removing Ajax loading in favour of JSON loading methods  [update] Divi Compatiblity  [update] Elementor Compatiblity  [update] Change hook: `jckpc-thumbnail-image-size` to `jckpc_thumbnail_image_size`  [update] Update dependencies  [fix] Fix html in notice within the Configurator tab  [fix] Enqueue admin styles when $pagenow == post-new.php so admin notices appear  [fix]  Attribute name sanitization (**Note**: test on staging to ensure sort order and images are all assigned correctly in product's Configurator tab)  [fix] `jckpc_defaults` not saving  [fix] WooThumbs compatibility when using a different folder name  [fix] Can't delete default image on global attribute  [fix] Old image is not deleted if new image is added with + button  [fix] Default zoom image on page load  [fix] Retina image is now loaded on page load