font2txf: Credits

- Mark J. Kilgard: Creator of the Texture Mapped Font (TXF) format.
- Chris Laurel and the Celestia project team: The initial authors of the original "ttf2txf" utility.
  https://web.archive.org/web/20051104023112/http://www.shatters.net/~claurel/celestia/fonts/tt2txf/
- Mickaël Cardoso (SiZiOUS): Complete refactoring of the project.
