This subchapter, § 21-8-601 et seq., § 21-8-701 et seq., and § 21-8-801 et seq. are supplemental to any other law pertaining to ethics or conflicts of interest and do not repeal any other law except for a law specifically repealed by this subchapter, § 21-8-601 et seq., § 21-8-701 et seq., or § 21-8-801 et seq.