docs: def byFileType( fileType ):
          """
          Looks up the language plugin by the inputed file type.
          
          :param      fileType | <str>
          
          :return     <XLanguage> || None
          """
          XLanguage.load()
          
          for lang in XLanguage._plugins.values():
              if ( fileType in lang.fileTypes() ):
                  return lang
          return None