YITH WooCommerce Deposits and Down Payments Premium 2.19.0

* New: added Product Bundle compatibility
* Fix: Multi Vendor plugin hide balance orders without commissions (vendor with commission rate 0%)
* Fix: product purchasable state can now be filtered by generic option too
* Tweak: removed balances from sales count on WC reports
* Tweak: preventing problems when suborder id doesn't exists
* Tweak: check if product exits
* Tweak: added currency on wc_price for deposit table and deposit list
* Updated: Dutch language

New: WordPress 5.2 support
Update: internal plugin framework
Fix: notice undefined variable on is_deposit_enabled_for_product
Fix: prevent notice Undefined variable $expiration_date
Fix: avoid adding extra label to cart total when no deposit is in cart
Fix: disable shipping on deposit order when option is checked
Tweak: change isset for empty in order to prevent no print suborders on the email
Tweak: preventing warning when checking deposits over a gift card product
Tweak: improved compatibility with Gift Card
Tweak: improved compatibility with Multi Vendor
Dev: added yith_wcdp_has_action_after_shop_loop_item filter
Dev: added yith_wcdp_single_deposit_price filter

* 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