BlenderExporter

- Contributed by reattiva. Read installation instructions from the Readme.txt
  file within the subdirectory

OgreBatchConverter

- Contributed by Carlo Carollo. Converts multiple Ogre .mesh.xml files (also from
  subdirectories) by invoking the OgreImporter tool. Use the CMake option
  ENABLE_EXTRAS to include in the build.

OgreMaxscriptExport

- Contributed by Vladimir Pobedinsky. A modified version of the Maxscript
  Exporter from the Ogre SDK that will import Ogre .mesh.xml files (for feeding
  into OgreImporter) and materials in Urho3D .xml format.