docs: def load(self):
          """load ALL_VERS_DATA from disk"""
          basepath = os.path.dirname(os.path.abspath(__file__))
          filename = os.sep.join([basepath, c.FOLDER_JSON, c.FILE_GAME_VERSIONS])
          Handler.ALL_VERS_DATA = {} # reset known data; do not retain defunct information
          with open(filename, "r") as f:
              data = json.loads( f.read() )
          self.update(data)
          self._updated = False