YITH WooCommerce Multi Vendor Premium 5.3.0

* Fix: Unable to set FREE SHIPPING for vendors

New: Ability to include vendor from vendors list shortcode
New: Option to change the background opacity for vendor's store header
Fix: Redirect URL when a user switches to another user or switches back
Fix: Font-awesome style is enqueue in all pages
Fix: No Add-ons on vendor suborder with YITH WooCommerce Product Add-ons
Tweak: Prevent upload button fails for string with single quote
Update: All language files
Update: Plugin FW
Dev: yith_wcmv_widget_quick_form_email_headers hook to filter email headers
Dev: yith_wcmv_add_vendor_taxonomy_to_product hook to skip add vendor to product method
Dev: yith_wcmv_is_vendor_page hook to filter is_vendor_page method
Dev: yith_wcmv_commissions_user_actions action
Dev: yith_wcmv_vendor_list_shortcode_args hook to change vendor list shortcode args

* New: Support for WordPress 5.0
* New: Support for Gutenberg
* New: Add Gutenberg Block for Multi Vendor shortcodes
* Fix: issue with shipping and a range of postcode
* Fix: Wrong status for parent order with BASC payment
* Fix: Vendor not associated to suborder on parent order change status
* Fix: product stock decreased twice when order is placed
* Fix: No tracking data in customer email
* Fix: prevent to add socials wrappers if no socials added