o Replaced WIN32 directory scanner with dirent_win.h

 o Replaced WIN32 directory scanner with dirent_win.h
 o The NamespaceURI property of AS-02 timed text files has been exposed in the API
   and via as-02-wrap -P. This behavior replaces previous bad behavior, but puts
   responsibility for selecting the correct value on the operator.
 o Exposed CreatePNGNameId and CreateFontNameId subroutines in AS_02::TimedText
 o Adjusted UUID generation based on PNG and font names to exclude paths by
   inserting a call to PathBasename at each Id generation site