Source/DoxygenTranslator/src directory is renamed Source/Doxygen
Renamed files in this directory to short names using lowercase as is the
convention for the rest of the SWIG source.
C++ extension is also .cxx like other SWIG source code.
I used doxy as the prefix for most file renames because without this
Doxygen/parser.* would be easily confused with CParse/parser.* so
Doxygen/doxyparser.* is renamed from DoxygenTranslator/src/DoxygenParser.*
