Add tool for extracting bitmap fonts from .fnl files (font archives).
This is mainly for testing the underlying .fnl reading code, which is
needed for proper font rendering in the MangaGamer version of Sengoku
Rance. In the future this tool could be updated to support rebuilding
font archives, which would allow adding special glyphs, using condensed
fonts, etc.
Credit to CookieWukk for reverse engineering the .fnl file format.
Nunuhara Cabbage