YITH WooCommerce Barcodes and QR Codes Premium 2.34.0

* New: support for WooCommerce 5.2
* Tweak: Improved the print barcodes options
* Update: YITH plugin framework

New: support for WordPress 5.7
New: support for WooCommerce 5.1
Tweak: added new option to generate the product QR Code using the product URL
Update: YITH plugin framework
Dev: included the custom field placeholder order_url, with the url of the order on my account
Dev: added new filter ywbc_order_shortcode_buttons_actions

* New: Support for WooCommerce 4.5
* Update: plugin framework
* Fix: fixed an issue with the product search query
* Fix: fixed the variation to not increase the stock automatically