Update to avoid modifying the FCB when file open/made #237
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We've moved to storing the cache of the open files on the host-side using a key based on the filename. This means that we no longer modify the Al[0] and Al[1] members of the FCB in-ram..
This closes #236 by making the caching an internal-detail, rather than something that guest-binaries could notice (via the changes to Al).