Also moved some XML specific stuff into its own directory, and refactored ReferenceLinker a bit. Change-Id: I912247a82023c1bbf72dc191fbdaf62858cbec0c
Comments weren't being copied when merged from the various resource tables. Also refactored the JavaClassGenerator to omit a class if no entries exist for it. Change-Id: I6eaa89b7b3715bc05403635a2baf0d1db3efd142