243.68 Trust funds.—All moneys received under ss. 243.50-243.77, whether as proceeds from the sale of bonds or as revenues, are considered to be trust funds to be held and applied solely as provided in ss. 243.50-243.77. Any officer with whom, or any bank or trust company with which, the moneys are deposited shall act as trustee of the moneys and shall hold and apply them for the purposes of ss. 243.50-243.77, subject to the provisions of ss. 243.50-243.77 and the resolution authorizing the bonds of any issue or the trust agreement securing the bonds.