fills a tree with nested parameters
        Args:
            tree: QtGui.QTreeView to fill
            parameters: dictionary or Parameter object which contains the information to use to fill

def fill_list(self, list, input_list):
        """
        fills a tree with nested parameters
        Args:
            tree: QtGui.QTreeView to fill
            parameters: dictionary or Parameter object which contains the information to use to fill
        """
        for name in input_list:
            # print(index, loaded_item, loaded_item_settings)
            item = QtGui.QStandardItem(name)
            item.setSelectable(True)
            item.setEditable(False)

            list.model().appendRow(item)