Hardcode quantization pass

src/codecs/imagequant/quantizer.ts

@@ -0,0 +1,7 @@
+import QuantizerWorker from './Quantizer.worker';
+
+export const name = 'Image Quanitzer';
+export async function quantize(data: ImageData): Promise<ImageData> {
+  const quantizer = await new QuantizerWorker();
+  return quantizer.quantize(data);
+}