This Charter shall not affect any vested rights or accrued liabilities of the Municipality of Solon, nor any right or liability in any pending suit or prosecution either on behalf of or against the Municipality, nor any contract heretofore entered into by the Municipality, nor any franchise heretofore granted by the Municipality, nor any prior or pending proceedings for the authorization of public improvements or the levy of assessments therefor. Except as a contrary intent appears herein, all acts of the Council of the Municipality in effect as of December 31, 1955, shall continue thereafter in effect until lawfully amended or repealed.