Affordable Housing; Authorizing the board of county commissioners and the governing board of a municipality, respectively, to approve the development of housing that is affordable, including mixed-use residential, on any parcel owned by religious institutions; requiring counties and municipalities to authorize multifamily and mixed-use residential as allowable uses in portions of flexibly zoned areas under certain circumstances; prohibiting counties and municipalities from requiring that more than a specified percentage of a mixed-use residential project be used for certain purposes; providing that it is the policy of the state to support housing for certain employees and to allow developers in receipt of certain tax credits and funds to create a specified preference for housing certain employees, etc.