Fix #8329: StorageService updates getting more expensive over time #8331
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Fixes #8329 which was caused by the inner maps of
cachedAvailableStacks
never getting removed: once the primary key of an AEKey would have been observed in the network, it would never get removed from the cached stacks. This causes performance to degrade over time if many different items are transiting through the network.The fix is simply the extra
removeEmptySubmaps
call. In this PR, I also removed the backbuffer because it looks pointless in the way it is currently implemented.