YITH WooCommerce Product Slider Carousel Premium 1.34.0

* Update: Plugin Framework
* Fix: Slider with multiple product categories shows wrong products

* New: Support to WooCommerce 3.4.5
* New: Support to WordPress 4.9.8
* Fix: Slider with multiple product categories doesn't show on frontend
* Update: Plugin framework
* Update: Language file
* Remove: Unnecessary files

* New: Support to WooCommerce 3.4.0
* New: Support to WordPress 4.9.6
* Update: Plugin Framework