YITH WooCommerce Brands 2.28.0

* New: added WooCommerce 3.5 support
* Tweak: updated plugin framework
* Tweak: fixed default values for VC shortcodes

* New: added WordPress 4.9.8 support
* New: added WooCommerce 3.5-RC support
* New: updated plugin framework
* Tweak: adding per page brands to the YITH Brand Thumbnail wigdet
* Tweak: two new parameters for widgets YITH Brands List (order / order by)
* Update: Italian language
* Update: Dutch language
* Fix: tax_query in brand shortcode
* Fix: term sorting for filter shortcode
* Dev: added yith_wcbr_sort_label filter to change Sort by brand label
* Dev: added yith_wcbr_taxonomy_label_name filter to change brands taxonomy name
* Dev: added yith_wcbr_show_sort_by_brand filter
* Dev: added yith_wcbr_set_sort_by_brand filter

* New: WooCommerce 3.4 compatibility
* New: WordPress 4.9.6 compatibility
* New: updated plugin framework
* New: GDPR compliance
* New: added new importer to let admin import product/brand connections when they already have brands set up and just want to associate them to related products
* New: added loop param to carousel shortcodes
* Tweak: updated Swiper Slider to 4.2.2
* Tweak: Improved support to YITH themes
* Update: Italian Language
* Update: Spanish Language
* Fix: fixed brand parameter for shortcodes
* Dev: added yith_wcbr_brand_thumbnail_carousel_time filter