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

So to suggest the interface for encoding from a `DOMString` into UTF-8 `Uint8Array`:

```webidl
partial interface TextEncoder {
  TextEncoderEncodeIntoResult encodeInto(StringView source, Uint8Array destination, bool last);
};

dictionary TextEncoderEncodeIntoResult {
  bool inputEmpty; // true if input was exhausted. false if more output space is needed
  unsigned long long read; // Number of UTF-16 code units read
  unsigned long long written; // Number of UTF-8 code units written
};

dictionary StringView {
  DOMString str;
  unsigned long long start; // index of the first UTF-16 code unit that's logically part of the view
  unsigned long long length; // length of the view in UTF-16 code units
};
```

Unpaired surrogates are replaced with the REPLACEMENT CHARACTER. Unpairedness analysis is done on a per view basis (i.e. ending a `StringView` with an unpaired surrogate means an unpaired surrogate even if the surrogate is paired in the underlying `DOMString`). Output is filled as much as possible without splitting a UTF-8 sequence in output.

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