Loads the last visible toolbars from the .ini file.

def load_toolbars(self):
        """Loads the last visible toolbars from the .ini file."""
        toolbars_names = CONF.get('main', 'last_visible_toolbars', default=[])
        if toolbars_names:
            dic = {}
            for toolbar in self.toolbars:
                dic[toolbar.objectName()] = toolbar
                toolbar.toggleViewAction().setChecked(False)
                toolbar.setVisible(False)
            for name in toolbars_names:
                if name in dic:
                    dic[name].toggleViewAction().setChecked(True)
                    dic[name].setVisible(True)