The tenure of any office not herein provided for may be declared by law, or, when not so declared, such office shall be held during the pleasure of the authority making the appointment, but the Legislature shall not create any office the tenure of which shall be longer than four (4) years, except as herein otherwise provided in this Constitution. In the case of any officer or employee of any municipality governed under a legally adopted charter, the provisions of such charter with reference to the tenure of office or the dismissal from office of any such officer or employee shall control.