The City shall have all powers, which 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 intended to confer upon the City every power, which it would have if it were specifically mentioned. The Charter shall be construed liberally in favor of the City and the specific mention of particular municipal powers in other sections of this Charter does not limit the powers of the City to those so mentioned.