AN ACT MANDATING THE APPOINTMENT OF A HUMAN SETTLEMENTS AND HOUSING OFFICER IN PROVINCES, CITIES AND MUNICIPALITIES, PROVIDING FOR ITS POWERS AND FUNCTIONS, AMENDING SECTIONS 17, 443, 454, 463, AND TITLE FIVE OF BOOK II OF REPUBLIC ACT NO. 7160, OTHERWISE KNOWN AS THE 'LOCAL GOVERNMENT CODE OF 1991', AND FOR OTHER PURPOSES