[whatwg/encoding] Additional UTF-8 and UTF-16 labels (#168)

Blink and WebKit support these additional aliases for UTF-8 and UTF-16:

UTF-8:
* unicode11utf8
* unicode20utf8
* x-unicode20utf8

UTF-16LE
* csunicode
* ucs-2
* unicode
* iso-10646-ucs-2
* unicodefeff

UTF-16BE
* unicodefffe

(Usable via TextDecoder constructor and the various declarative mechanisms)

The usage is presumably small, but we don't have actual numbers. And I'm lazy. Should we just go ahead and add them?

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