Remove constructor

[dy]

Constructing a function is unreasonable:

let sine = generate.sine({frequency: 1000})
sine(1024)
sine(1024, {frequency: 2000})

• we still keep options argument for "changing state"
• "live" options take all the same properties as constructor options
• that is hard to remember routine, empirically.

More natural is to have instant signature as generate.<what>(<how much>, <how?>):

let result = generate.sine(1024, {frequency: 1000})
generate.sine(1024, {frequency: 2000, phase: result.phase })

That also allows for reducing difficult audio-through dependency.

[dy]

Another optimizations:

• no need for a-rate params as functions - that is done via direct options; that slows down massive generation
• no need for syntax sugar: complicates generation whereas benefit is tiny

[dy]

Ways to persist state?

1. Provide properties on the output array. That forbids deepEqual and not well established pattern, although pretty handy. Does not allow to generate a sequence of linked arrays.
2. Keep internal weakmap cache of per-instance states. Does not allow to generate a sequence of linked arrays.
3. Use global state - generates a sequence of arrays.

[dy]

Done in 3.0.1.
Explicitly persisted state is better than implicit.