Different Chemical Environments of [Ge$_4$Se$_{10}$]$^{4-}$ in the Li$^+$ Compounds [Li$_4$(H$_2$O)$_{16}$][Ge$_4$Se$_{10}$]·4.33H$_2$O, [{Li$_4$(thf)$_{12}$}Ge$_4$Se$_{10}$], and [Li$_2$(H$_2$O)$_8$][MnGe$_4$Se$_{10}$], and Ionic Conductivity of Underlying “Li$_4$Ge$_4$Se$_{10}$”