By the passage of this ordinance, no presently illegal use shall be deemed to have become legalized, unless specifically such use falls within a use district where the actual use is now a conforming use. Otherwise, such uses shall remain nonconforming uses, or illegal uses, as the case may be. It is further the intent and declared purpose of this ordinance that no offense committed, and no liability, penalty or forfeiture, either civil or criminal, incurred prior to the time this zoning ordinance was adopted, shall be discharged or affected by such adoption; but prosecutions and suits for such offenses, liabilities, penalties or forfeitures may be instituted or proceeded with in all respects as if such ordinance had not been adopted.