Nothing in this Chapter shall repeal or amend any city charter in effect as of January 1, 1972, or any portion thereof, unless this Chapter or a subsequent enactment of the General Assembly shall clearly show a legislative intent to repeal or supersede all local acts. The provisions of this Chapter, insofar as they are the same in substance as laws in effect as of December 31, 1971, are intended to continue such laws in effect and not to be new enactments. The enactment of this Chapter shall not require the readoption of any city ordinance enacted pursuant to laws that were in effect before January 1, 1972, and are restated or revised herein. The provisions of this Chapter shall not affect any act heretofore done, any liability incurred, any right accrued or vested, or any suit or prosecution begun or cause of action accrued as of January 1, 1972. (1971, c. 698, s. 1.)