Mixed Lithium Magnesium Aryl Oxides Derived from Cresol - Crystal-Structures and Solution NMR-Studies of an Unexpected, Magnesium-Rich Oxo Product with a Trigonal Bipyramidal Limg4 Cage and an Expected Lithium-Rich Product with a More Familiar Li-Center-Dot-Center-Dot-Center-Dot-Mg-Center-Dot-Center-Dot-Center-Dot-Li Chain