WP File Download - Joomunited 6.1.6

* Fix : WP File Download Search engine conflict with WPML
* Fix : Compatible with Elementor latest
* Fix : PHP warning on Plain text search indexer
* Fix : Style issue in table theme

* Fix : Wrong search multi category file on WP File Download Search engine
* Fix : Admin file search issue
* Fix : Wrong ordering on duplicating category
* Fix : Custom ordering not work with multi category file
* Fix : Style issue on Gutenberg Categories block
* Fix : Table's clone theme not work as expected

* Add : Option to limit the number of downloads per user per any given time period
* Fix : Update new placeholder image for page builder and classic editor
* Fix : Improve the search in category list in WP File Download category Gutenberg widget and Divi module