Method: Modify term clauses.
Method: Add category sorting in list filters.
Method: Custom question category fields.
Method: Image field in category form.
Method: Process and save category images.
Method: Add category pages rewrite rule.
Method: Filter main questions query args. Modify and add category args.
Method: Subscriber action ID.
Method: Filter ask button link to append current category link.
Method: Filter canonical URL when in category page.