Re: [whatwg/encoding] TextEncoder#encode - write to existing Uint8Array (#69)

@ricea I tried to rewrite your example for inclusion in the standard:
```js
function convertString(buffer, input, callback) {
  let bufferSize = 256;
  let bufferStart = malloc(buffer, bufferSize);
  let bytesWritten = 0;
  let offset = 0;
  while (true) {
    const {read, written} = cachedEncoder.encodeInto(input.substring(offset), new Uint8Array(buffer, bytesStart + bytesWritten, bufferSize - bytesWritten));
    offset += read;
    bytesWritten += written;
    if (offset === input.length) {
      callback(bufferStart, bytesWritten);
      free(buffer, bufferStart);
      return;
    }
    bufferSize *= 2;
    bufferStart = realloc(buffer, bufferStart, bufferSize);
  }
}
```
For the length argument to Uint8Array, shouldn't bufferStart also be subtracted? (I also changed offset = read to offset += read. Better names welcome.)

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