Add a cache for memory stick usage #14825
Merged
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See #13847 - this will at least reduce how often we recalculate the size of SAVEDATA, by caching it between writes.
Flushes this cache on any write to the memory stick (not just savedata, for simplicity and durability), and also when resuming/focusing the app. This is to make sure external deletions work in a mostly sane way to reduce usage.
-[Unknown]