Helping function of `_parse_features` that parses a list.

def _parse_list(features, new_names):
        """Helping function of `_parse_features` that parses a list."""
        feature_collection = OrderedDict()
        for feature in features:
            if isinstance(feature, FeatureType):
                feature_collection[feature] = ...

            elif isinstance(feature, (tuple, list)):
                for feature_type, feature_dict in FeatureParser._parse_tuple(feature, new_names).items():
                    feature_collection[feature_type] = feature_collection.get(feature_type, OrderedDict())

                    if feature_dict is ...:
                        feature_collection[feature_type] = ...

                    if feature_collection[feature_type] is not ...:
                        feature_collection[feature_type].update(feature_dict)
            else:
                raise ValueError('Failed to parse {}, expected a tuple'.format(feature))
        return feature_collection