YITH Dynamic Pricing per Payment Method for WooCommerce 2.24.0

* New: Support to WooCommerce 3.6.0 RC1
* Update: Plugin-Fw
* Update. Italian language
* Update: Spanish language

* New: Support to WooCommerce 3.6.0 RC1
* Update: Plugin-Fw
* Update. Italian language
* Update: Spanish language

Fix: Disable tax on rule if set it to none
Update: Dutch translation
Update: Plugin framework
Dev: filter yith_wcdppm_order_fee_title