ole32: Fix the OLE clipboard test to call OleInitialize before performing the tests to fix test failures on Windows.

ole32: Add a field to the TLS data to determine whether OLE has been initialised for the current thread.

ole32: IPeristStream implies IPersist and IStream implies ISequentialStream so fix the Structured Storage stream implementation's QueryInterface with to reflect this.

ole32: IStream inherits from ISequentialStream so the HGLOBALStream implementation must also support ISequentialStream.

Fix the code so it compiles without warnings.

Fix the code so it compiles without warnings.

Fix the code so it compiles without warnings.

Fix the code so it compiles without warnings.

Fix the code so it compiles without warnings.