Synthesis, Nematicidal and Antimicrobial Activity of 3-(5-3-Methyl-5-[(3-methyl-7-5-[2-(aryl)-4-oxo-1,3-thiazolan-3-yl]-1,3,4-thiadiazol-2-ylbenzo[<i>b</i>]furan-5-yl)methyl]benzo[<i>b</i>]furan-7-yl-1,3,4-thiadiazol-2-yl)-2-(aryl)-1,3-thiazolan-4-one