Tone with FM and AM

First working prototype.

Fully working node editor with nodes:

• constant
• sine wave
• add
• multiply
• output (only one, always present, undeletable)
• comment (only cosmetic node to keep text notes)

Outputs can be reused in multiple inputs. Input can be only one.
Synth is cached so it is recreated only when something is changed.
It is possible to set the length of the generated sound to simulate one-shot samples.
Code is compilable and tested for WebAssembly and Windows.