ole32: Add test showing storage objects can't be opened twice.

[Vincent Povirk]

Opening a storage object a second time fails, and deleting an object that's open invalidates it. This implies that storages need to be aware of the storages and streams that are open one level beneath them.

This is a good argument for caching bits of the directory structure. If we can have an in-memory copy of a directory entry, we can add fields to it, including a pointer to an open storage object.
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