AliExpress Dropshipping Business plugin for WooCommerce 3.5.6

*Fix country select dialog
*Fix long variation attributes names bug
*Fix background loader script bug

*Optimized the product background loader and plugin code
*Fix a discount calculation bug

*Fixed shipping selector bug on the checkout page; it occurred in the latest Woocommerce
*Fixed the currency symbol placement bug, now the placement can be managed via appropriate settings in Woocommerce.
*Improved the product background loader; I should work more stable now.
*Fix a lot of minor bugs