YITH WooCommerce Gift Cards Premium 4.10.0

* New: support for WordPress 5.8
* New: support for WooCommerce 5.5
* New: added new Help tab in the plugin settings
* Update: YITH plugin framework
* Fix: Allow uppercase in image extension
* Fix: fixed the image upload limit in the popup

* New: support for WooCommerce 5.3
* Update: YITH plugin framework
* Fix: fixed the import of the gift cards with a gift card ID
* Fix: fixed a console error related to the select2
* Dev: minor CSS changes
* Dev: added classes to the gift card details in cart
* Dev: convert the gift card value in my account using WPML
* Dev: added a is_array condition to avoid errors in the credit note generation

* New: support for WordPress 5.7
* New: support for WooCommerce 5.1
* New: added new shortcode to display the Gift this product form [yith_ywgc_display_gift_this_product_form]
* Update: YITH plugin framework
* Update: language files
* Fix: fixed the MM d, yy format in the gift card export
* Fix: added a condition to prevent errors when the product purchased as a gift has beeen deleted
* Dev: added new filter yith_ywgc_frontend_select2_load
* Dev: added a script in the export button to prevent the browser message
* Dev: changed the yith_wcgc_display_input_hidden_disable_gift_this_product hook priority
* Dev: add more conditions depending on the enabled features to the styles and scripts enqueue
* Dev: added new filter ywgc_gift_card_product_image_in_cart
* Dev: adding more security checks to the custom uploaded file