Method: Append meta display.
Method: Load admin assets in categories page.
Method: Enqueue required script
Method: Register Categories options.
Action Hook: This action can be used to show custom message before category page.
Filter Hook: Filter applied before getting categories.
Filter Hook: FILTER: ap_question_category_labels Filter ic called before registering question_category taxonomy
Filter Hook: Filter is called before registering question_category taxonomy.
Class: Categories addon class.
Method: Initialize the class.