The exercise of the powers, privileges, and authorities conferred on municipalities by this Part are public and government functions, exercised for a public purpose and matters of public necessity. In the case of a county, the exercise of the powers, privileges and authorities conferred by this Part is a county function and purpose, as well as a public and governmental function. In the case of any municipality other than a county, the exercise of the powers, privileges, and authorities conferred by this Part is a municipal function and purpose, as well as a public and governmental function. (1983, c. 775, s. 1.)