Cleanup resources registered for jobs that have since exited
This defines the user-visible name of this task. It is defined in the subclasses.
This method is responsible for executing the task.
At the scheduled time, the Task Manager creates an instance of this object, sets any property values using the stored "Settings" for the task, and then invokes this method to execute the task.
In order to execute a real task, override this method in a subclass.