Function: Utility function to check if the data upgrade for Quiz Questions has been run.
Method: Initialize the processing timer.
Method: Check if the process timer is out of time.
Method: Remove the processing transient for instance.
Method: Get the processing transient for instance.
Method: Set the processing transient for instance.
Action Hook: Fires on admin data upgrades init
Method: Return the last run details for the last completed data upgrade for the instance.
Method: Entry point to perform data upgrade for instance.
Method: Public constructor for class
Method: Get the current instance of this class or new.
Method: Add instance to static tracking array
Method: Register the data upgrade action.
Method: Initialize the LearnDash Settings array
Method: Get the LearnDash Settings array
Method: Set data upgrade option for instance.
Method: General admin_init hook function to check admin notices.
Method: Shows Data Upgrade admin notice.
Method: Trigger admin notice if Data Upgrades need to be performed.
Method: Show the admin page content.