cellSaveData improvements #6637
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Nekotekina
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This routine: 1) Removes junk backup directories 2) Fixes interrupted save data process in edge case This case can happen if emu terminates between two atomic renames. Also use directory renaming technique for delete op. Also rewrite recreate operation to be part of atomic process.
Make sure the changes which are already done are written.
Possibly fixes sys_fs_rmdir and other cases of directory removal. Make sure the directory with deleted files always becomes empty. For this purpose, temp files are moved to the root of the device.
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Add savedata maintenance routine:
This case can happen if emu terminates between two atomic renames.
Also use directory renaming technique for delete op.
Improve sys_fs_unlink and sys_fs_rmdir behaviour on Windows.