didnt commit this patch because curves are generally better to create a shape to lathe however now that curves can have modifiers applied to them I think its good to have this. Added options to offset the lathe so it can work like the screw tool as well. - optional object for axis which also controls the center point. - screw offset so rather then just lathing this can work more like the screw tool. - screw optionally using the object distance along the axis. - iterations so the screw can be applied multiple times. tested to work well with curves.