Update (x)dvipdfmx driver code based on more testing

The special "pdf:literal" is not documented but seems to work more-or-less in
the same way as \pdfliteral. This allows a rather cleaner approach in the
driver, and seems to still work with material scaled/rotated by graphics.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4641 de43f980-851b-0410-b2f7-c40aca1f87e0