WP File Download - Joomunited 6.1.6

* Add : Possibility to bulk tagging for files
* Fix : Preview file not working when users access at the same time
* Fix : Delete file(s) not working on admin search

* Add : Compatibility with WP File Download Addon version 4.8 - NextCloud integration

* Add : Possibility to show categories color on front-end
* Fix : Preview file not working on mobile