Nothing contained in Articles 1 through 13 of this chapter shall be so construed as to modify, abridge, or impair any of the rights or powers granted to cities and towns under any provision of the Constitution of this State and every right, power or privilege conferred upon any city or town by the Constitution of this State otherwise appearing to be modified, abridged or impaired by any provision of Articles 1 through 13 of this chapter is to be deemed excepted from the operation thereof.