WP File Download - Joomunited 6.1.6

* Add : Implement server folder synchronization
* Add : Regenerate single file preview from the latest file version
* Add : Preview theme: Display preview image from custom icon on file
* Fix : Wrong real path

* Fix : File download issues with filenames containing special characters
* Fix : Wrong icon path in some cases
* Fix : The single icon builder not saving
* Fix : Password protected files not working
* Fix : Resolves several issues in the Tree theme

* Add : Preview WP File Download blocks in Gutenberg Blocks Editor
* Add : New WP File Download Search engine block in Gutenberg Blocks Editor
* Add : Download link from the JoomUnited file previewer
* Add : Possibility to filter for all files waiting for approval in the admin search
* Add : New option to display breadcrumbs for the Tree theme
* Fix : New uploaded files will display in the category without refreshing page
* Fix : Wrong icon path in some cases
* Fix : Fatal error in some cases