[whatwg/streams] Update TransformStream API & misc. fixups (#519)

First pass at issue #518 included -- haven't replaced done() with returning a Promise from `transform()` yet, due to an incredible number of failing tests that never complete when I tried. Still working on that one.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/519

-- Commit Summary --

  * transform-stream: fix typo
  * add TransformStreamController
  * test TransformStream error()
  * TransformStream: use InvokeOrNoop
  * move to promises transformstream but ??? why are tests failing and never completing now

-- File Changes --

    M reference-implementation/lib/transform-stream.js (59)
    M reference-implementation/test/pipe-through.js (22)
    M reference-implementation/test/transform-stream-errors.js (3)
    M reference-implementation/test/transform-stream.js (140)

-- Patch Links --

https://github.com/whatwg/streams/pull/519.patch
https://github.com/whatwg/streams/pull/519.diff

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