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ad75215bb0
A small, nonexhaustive set of warning fixes. The DiscIO Volume change is a workaround for a GCC bug [1] that causes returning an unengaged std::optional to emit annoying -Wmaybe-uninitialized warnings. This last change alone fixes pages upon pages of warnings since Volume.h is included from several files. -Wstringop-truncation is another irrelevant warning for us, but unfortunately there seems to be no way to disable it without adding ugly pragmas wherever the warning appears.