        * h_min         (int)    :   1    - the minimum TOC header level to use; any header lower than this value will be ignored
            * h_max         (int)    :   6    - the maximum TOC header level to use; any header greater than this value will be ignored
            * ordered       (bool)   : false  - when set to true, an ordered list will be outputted instead of an unordered list
            * item_class    (string) :   ''   - add custom class(es) for each list item; has support for '%level%' pl