Complexes with S-Donor Ligands, 4. Mono- and Di-Homo- and -Hetero-Nuclear Gold(I), Silver(I), and Palladium(II) Complexes with 2-(Methylthio)pyridine, Pyridine-2(1H)-thione, and Benzoxazole-2(3H)-thione. Some Examples of the Use of Complexes as Ligands†