Method: Hook meta boxes in post edit screen.
Method: Render Meta Box content.
Method: Question meta box.
Method: Show flags and clear flag button in post edit screen.
Method: Init class.
Method: Check if old ap_meta table exists.
Method: Check if tables are updated, if not create it first.
Method: Get all completed and uncompleted tasks.
Method: Send ajax response.
Method: Migrate question and answer.