* Fix : Compatibility with ACF plugin free version
* Fix : ACF fields not working when disabling Theme settings per category, Theme per category options
* Fix : Missing files when using the tree theme
* Add : Possibility to use ACF fields to add custom data to WP File Download files
* Fix : Improve tooltip on categories and file settings
* Fix : Server folder synchronization not working when the file path is too long
* Fix : Remove multiple category from file settings not working on admin
* Fix : Some PHP warnings on front-end
