The general grant of municipal power conferred by this chapter and this title on legislative bodies of noncharter code cities and charter code cities is intended to confer the greatest power of local self-government consistent with the Constitution of this state and shall be construed liberally in favor of such cities. Specific mention of a particular municipal power or authority contained in this title or in the general law shall be construed as in addition and supplementary to, or explanatory of the powers conferred in general terms by this chapter.