Except as provided in section 12 of this article, nothing in this Charter shall be taken in anywise to affect or repeal any law heretofore legally passed by the commission of the City of Texas City, nor to affect any other act of the mayor, commission or other officer or officers of the City of Texas City legally performed, under which any rights have been vested, and all ordinances, orders, laws, and grants shall be continued in full force and effect.