The adoption of this charter shall not affect any pre-existing rights of the city, nor any right or liability or pending suit or prosecution, either on behalf of or against the city or any officer thereof, nor any franchise granted by the city, nor pending proceedings for the authorization of public improvements or the levy of assessments therefor. All ordinances and resolutions in force on the effective date of this charter and not inconsistent with the provisions of this charter shall continue in full force and effect until amended or repealed by council.