The right of the initiative and referendum is reserved to the people of the County on all matters which such County may now or hereafter be authorized to control by legislative action. The provisions of general law relating to such right applicable to municipalities in effect at the time of the adoption of this Charter shall govern the exercise of such right hereunder, provided that all powers and duties respecting initiative or referendum petitions imposed upon city auditors or village clerks by general law shall be exercised by the Clerk of Council.