@package: Scheduler

Method: Add a task to the fatal tasks list to be marked as failed.

Method: Mark fatal tasks as failed.

Method: Run tasks immediately if we have a define.

Method: Returns if a task is currently in progress (enqueued or running).

Method: Add progress notice.

Method: Add an admin notice.

Method: Show admin notices related to the scheduled tasks.

Method: Construct.

Method: Returns the full group name.

Method: Register an action tasks.

Method: Add a task to the queue.

Method: Init the global scheduler stuff.