YITH WooCommerce Account Funds Premium 1.35.0

* New: Support to WooCommerce 3.5.0 RC1
* New: Option to apply the coupon code to purchase funds
* Tweak: Add funds process
* Update: Plugin Framework
* Fix: Transaction history pagination issue

* Update: Plugin Framework
* Fix: Conversion issues during refund process using WooCommerce Multilingual

* New: Add a column in Log table to show the fund editor
* Update: Plugin Framework
* Update: Italian language
* Fix: Conversion issues with funds using WooCommerce Multilingual