Vectorfield

Create a vector field that takes in an array of two functions and then an xData and yData array. These arrays contain three values start, steps, and end [[f:,f:], [xStart, xSteps, xEnd], [yStart, ySteps, yEnd]]

```graph
bounds: [-10, 10, 10, -10]
elements: [
	{type: vectorfield, def: [[f:sin(y), f:cos(x)], [-6,25,6], [-5,20,5]]}
]
```