LearnDash LMS BbPress Integration Addon 2.2.4

* Fix - Forum widget no longer lists all forums when on a quiz page.
* Fix - Invalid supplied argument error when using Forum Course widget.

* Fixed setting field labels don't point to their fields
* Fixed some formatting and improved variable names
* Fixed incorrect and refactor forum access check logic
* Fixed custom message on topic page doesn't follow forum setting

* Added course forum widget
* Updated name and moved `functions.php` and `forum-widget.php`
* Updated load translation function
* Updated addon name to match the other addons
* Fixed issue with forum link not working for non logged in users
* Fixed course forums not displaying on bbp page other than forums page