Saves the current configuration of shape, colour, and text
$.state.save( )
Examples
function update() {
//first rectangle
$.colour.fill = "red";
$.shape.strokeWidth=3;
$.shape.rectangle(50,50,50,50);
$.state.save();
//second rectangle
$.colour.fill = "blue";
$.shape.strokeWidth=5;
$.shape.rectangle(100,100,50,50);
$.state.load();
//third rectangle
$.shape.rectangle(150,150,50,50);
}