draggableMultiLine
fun <T : Any> FeatureGroup<T>.draggableMultiLine(points: List<FeatureRef<T, MarkerFeature<T>>>, id: String? = null): FeatureRef<T, MultiLineFeature<T>>
fun <T : Any> FeatureGroup<T>.draggableMultiLine(points: List<T>, id: String? = null): FeatureRef<T, MultiLineFeature<T>>