YITH WooCommerce Deposits and Down Payments Premium 2.28.0

* New: WooCommerce 3.7.0 RC2 support
* Tweak: cast deposit value to double to avoid "non numeric value" error
* Tweak: add fees on grand total on cart and checkout page
* Tweak: change balance order status to pending payment when deposit order status changed from failed status
* Tweak: add paragraph in deposit and balance payment for show inline block in all webmail clients
* Update: Italian language
* Update: internal plugin framework
* Fix: removed useless yith_wcpb_ajax_update_price_request trigger that used to break js execution on variable products
* Fix: get correct parent product id when a variation is selected
* Fix: expiration days are now added to today's date
* Fix: notice on thank you page
* Dev: added new filter yith_wcdp_show_total_html
* Dev: added new filter yith_wcdp_deposit_print_product_note
* Dev: added new filters for sending deposit expiration email

* 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