YITH WooCommerce Email Templates Premium 1.40.0

* Fix - price formatting in email preview
* Update - Plugin Framework

* New - support to WooCommerce 3.5.x
* New - stylize all WordPress emails
* New - possibility to preview email template without saving
* New - Additional CSS for each email template
* New - possibility to customize social icons
* New - preview for different devices: desktop, tablet, mobile
* Fix - integration with YITH WooCommerce Review Reminder
* Fix - issue in combination with WooCommerce 3.2.x
* Fix - duplicate footer issue in combination with WooCommerce Gernamized
* Update - Plugin Framework
* Update - language files
* Update - Spanish language
* Dev - added yith_wcet_order_details_show_order_title filter

* New - support to WooCommerce 3.4
* New - support to WordPress 4.9.6
* New - youtube social links
* Fix - escape texts in emails
* Tweak - fixed var names
* Update - Italian language
* Update - Dutch language
* Update - WooCommerce 3.4 templates
* Update - plugin framework
* Dev - added yith_wcet_order_details_table_totals_table_width_percentage filter