Toolchain Steps
  A) ttf --> bdf
    Conversion with otf2bdf
  B) bdf --> c-file
    Conversion with bdf2u8g

Source Folders
  bdf: Fonts which are available as bdf file (x11 fonts, unifont)
  ttf: Fonts which are available as ttf file
  
Rebuild
  Execute "do_u8g_fonts.sh" inside build folder
  
