clears elements from a map
clear_markers(map, layer_id = NULL)clear_circles(map, layer_id = NULL)
clear_heatmap(map, layer_id = NULL)
clear_traffic(map)
clear_transit(map)
clear_bicycling(map)
clear_polylines(map, layer_id = NULL)
clear_polygons(map, layer_id = NULL)
clear_rectangles(map, layer_id = NULL)
a googleway map object created from google_map()
id value of the layer to be removed from the map