This act shall be construed liberally to effectuate the legislative intent and purposes of this act as found and stated in section 2. This act constitutes complete and independent authority for the performance of each and every act and thing authorized by this act, and all powers granted by this act shall be broadly interpreted to include any power reasonable and convenient to effectuate the intent and purposes of this act, and the language used in this act shall be read as grants of authority and not as limitations of powers to those expressed or necessarily implied.