YITH WooCommerce Deposits and Down Payments Premium 2.28.0

* New: WooCommerce 3.6 support
* New: added options to make deposits expire on a specific date
* New: added option to choose whether deposit or balance should be virtual
* Tweak: improved frontend price handling - now js uses accounting library to format price
* Tweak: always retrieve a fresh product on is_deposit_enabled_on_product method, to avoid unexpected behaviour
* Tweak: improved deposit-list template for emails
* Update: internal plugin framework
* Update: Italian language
* Update: Spanish language
* Dev: added yith_wcdp_my_account_print_quick_deposit_action filter
* Dev: added second parameter to yith_wcdp_virtual_on_deposit filter (order)
* Dev: Added a new condition to modify the stock status

• New Updated plugin framework
• Fix Plugin do not create suborders when only shipping is added to balance

* New: support to WooCommerce 3.5.x
* New: support to WordPress 4.9.8
* New: added suborder status synch when main order is cancelled
* New: deposit template is now loaded via ajax, if dedicated option is enabled
* Tweak: improved YITH WooCommerce Product Add-ons compatibility
* Tweak: improved totals, tax and coupon calculation, when deposit is applied to cart
* Update. Italian language
* Update: Spanish language
* Fix: payment complete status for orders that contains only deposits
* Fix: avoid WooCommerce increasing sales counter twice for a product purchased with deposit
* Dev: new filter yith_wcdp_deposist_value
* Dev: new filter yith_wcdp_product_price_for_deposit_operation
* Dev: new action yith_wcdp_after_add_deposit_to_cart
* Dev: new filter yith_wcdp_show_cart_total to filter cart total displayed value
* Dev: new filter yith_wcdp_show_cart_total_html to filter cart total html
* Dev: new filter yith_wcdp_is_deposit_mandatory to let third party dedvelopers set deposit as mandatory on product level via code