YITH WooCommerce Gift Cards Premium 4.10.0

* New: Support for WooCommerce 4.3
* Tweak: Added new option to select the gift card delivery interval and a button to update the cron
* Update: plugin framework
* Update: plugin language
* Fix: fixed the converted balance using WPML and the gift cards as coupons
* Fix: fixed the converted amount using WPML and the gift cards as coupons
* Fix: fixed the gift card not applied when the order is edited
* Dev: move the ywgc_add_gift_card_coupons_as_negative_fees filter
* Dev: changed delivered gift card email image into PNG format
* Dev: added $context param to ywgc_custom_company_logo_url and ywgc_custom_header_image_url filters
* Dev: calculate the correct VAT amount in the checkout
* Dev: added new filter 'yith_ywgc_mpdf_directionality'
* Dev: added new action ywgc_verify_coupon_code_condition
* Dev: added new param to filter yith_ywgc_check_gift_card_return
* Dev: added the ywgc_apply_gc_code_on_gc_product condition using a gift card as coupon
* Dev: change the physical gift card info title to h5
* Dev: fix a possible warning in the email using product addons
* Dev: changed some wrong filter names
* Dev: minor changes

* Tweak: automatically send the preprinted gift card email when the code is created and the order updated
* Update: updated the Elementor icons
* Fix: prevent a preprinted gift card to be sent without code
* Fix: fixed a problem with the tax calculation
* Fix: added some fixes to the taxes using coupons, enable it returning true here ywgc_add_gift_card_coupons_as_negative_fees
* Dev: updated some template classes
* Dev: avoid send a gift card without delivery date
* Dev: new filter ywgc_add_gift_card_coupons_as_negative_fees

* New: added plugin shortcodes to the Elementor panel
* Fix: fixed an error with the non existing product object
* Dev: all strings escaped