Add initial support for reading BinaryOnly OME-TIFF datasets

This adjusts the type detection slightly so that .companion.ome files
are detected as OME-TIFF, not OME-XML (as this makes finding and reading
the corresponding OME-TIFF files much easier).  Selecting either a
BinaryOnly OME-TIFF file or the corresponding companion OME-XML file
should result in the entire dataset being read.

Fixes #11951.
Catch NPEs when calling getBinaryOnlyMetadataFile
Ignore metadata files with a .tif/.tiff suffix

Some Prairie datasets contain "OME-TIFF" files with a BinaryOnly entry
that points to a different "OME-TIFF", which is not valid.
Merge pull request #1090 from melissalinkert/binary-only

Add initial support for reading BinaryOnly OME-TIFF datasets