Adding native encoders (#71)

* Adding browser png

* Adding native JPEG & file size output

* Removing log

* Fixing blob typing

* Fix timing issue

src/codecs/browser-png/encoder.tsx

@@ -0,0 +1,14 @@
+import { canvasEncode } from '../../lib/util';
+
+export interface EncodeOptions {}
+export interface EncoderState { type: typeof type; options: EncodeOptions; }
+
+export const type = 'browser-png';
+export const label = 'Browser PNG';
+export const mimeType = 'image/png';
+export const extension = 'png';
+export const defaultOptions: EncodeOptions = {};
+
+export function encode(data: ImageData, options: EncodeOptions) {
+  return canvasEncode(data, mimeType);
+}