Function ticks

ticks(fn: Modulate, totalTicks: number): () => number
Produce modulate values with each invocation. When the time is complete, the final value continues to return. Timer starts when return function is first invoked.

If you need to check if a modulator is done or reset it, consider tickModulator.
```
const fn = (t) => {
 // 't' will be values 0..1 representing elapsed ticks toward totwal
}
const e = ticks(fn, 100);

// Keep calling e() to get the current value
e();
```
Parameters
- fn: Modulate
  Function that produces 0..1 scale
- totalTicks: number
  Total length of ticks
Returns () => number