The city shall have all powers which it may now or hereafter be possible for a municipal corporation in this state to exercise in harmony with the constitutions of this state and of the United States. It is the intention of this charter that every power which the people of the City of Benson might lawfully confer upon themselves as a municipal corporation by specific enumeration in this charter shall be deemed to have been so conferred by the provisions of this section. This charter shall be construed liberally in favor of the city and the specific mention of particular powers in the charter shall not be construed as limiting in any way the generality of the power herein sought to be conferred.