Implement enhanced category and course replication, improving the handling of both by ensuring new and existing categories are processed correctly. Introduce CLI support for bulk category imports using a dedicated flag and provide helper functions like `generateRandomString` and `removePath` for file management. Add a new `trigger_all.php` script to trigger replication for all courses and an `unenroll.php` script for unenrolling users with cleanup of related data.
Includes error handling improvements and directory structure checks.
