message: adding oscillator types
diff: export { Noise } from "./Noise";
  export { Oscillator } from "./oscillator/Oscillator";
  +export { AMOscillator } from "./oscillator/AMOscillator";
  +export { FMOscillator } from "./oscillator/FMOscillator";
  +export { PulseOscillator } from "./oscillator/PulseOscillator";
  +export { FatOscillator } from "./oscillator/FatOscillator";
  +export { PWMOscillator } from "./oscillator/PWMOscillator";
  export { ToneOscillatorNode } from "./oscillator/OscillatorNode";
  export { ToneBufferSource } from "./buffer/BufferSource";
  