The provisions of Sections 21-39-1, 21-39-3, 21-39-7 through 21-39-19, shall be applicable to all municipalities of this state, whether operating under a code charter, special charter, or the commission form of government, except in cases of conflict between the provisions of such sections and the provisions of the special charter of a municipality, or the law governing the commission form of government, in which cases of conflict the provisions of the special charter or the statutes relative to the commission form of government shall control.