Function pendulumForce

The pendulum force swings something back and forth.

// Swinger
let thing = {
  position: { x: 1, y: 0.5 },
  mass: 0.1
};

// Position thing swings from (middle of screen)
const pinnedAt = {x: 0.5, y: 0.5};

// Create force: length of 0.4
const pendulumForce = Forces.pendulumForce(pinnedAt, { length: 0.4 });

continuously(() => {
 // Apply force
 // Returns a new thing with recalculated angularVelocity, angle and position.
 thing = Forces.apply(thing, pendulumForce);
}).start();
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