The charter shall not affect any vested rights or accrued liabilities of the City, or any right or liability in any pending suit or prosecution either on behalf of or against the City, or any contract entered into by the City prior to its adoption, or any franchise granted by the City prior to its adoption, or any prior or pending proceeding for the authorization of public improvement or the levy of assessments therefor. Except as a contrary intent appears herein, all acts of Council of the City in effect on the date this charter was approved shall continue thereafter in effect until lawfully amended or repealed.