docs: def save(self, filename):
          """
          Saves the settings to the inputed filename.
          
          :param      filename | <str>
          """
          dirname = os.path.dirname(filename)
          if not os.path.exists(dirname):
              os.makedirs(dirname)
          
          projex.text.xmlindent(self._xroot)
          xtree = ElementTree.ElementTree(self._xroot)
          xtree.write(filename, encoding=self.encoding(), xml_declaration=True)
          return True