pointer value, be sure to always store it (spotted by Peter
Oberndorfer).

current frame for some of the registers we know of (frame pointer,
stack pointer).

ole32: Add tests for invalid clipformat/tymed combinations in IOleCache:Cache and for caching formats with a clipformat of 0.

ole32: In the data cache, fmtetc->cfFormat and fmtetc->tymed can be 0 which means to match any clipformat/tymed.

Therefore, keep the clipformat of the data in the data_cf field.
Return an error from SetData if a non-zero clipformat hasn't been specified.
Write out stgmedium.tymed instead of fmtetc.tymed, which is guaranteed 
to be non-zero if data has been set.

ole32: Check that the specified clipboard format and tymed are valid in IOleCache::Cache in the data cache.

ole32: The width of the metafile drawn should be 3 times the icon width in OleMetafilePictFromIconAndLabel.

ole32: Use the default icon title font when writing the caption text out in OleMetafilePictFromIconAndLabel.