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Unify sync & async token transformer signatures

* All token transformers have the (token, prevToken, cb) signature.
  Both Async and Sync TTMs invoke transformers with that signature.

  - Sync TTM passes null for cb
  - Async TTM passes null for prevToken
  - Only Quote Transformer uses the prevToken arg. If possible,
    we should get rid of it and eliminate prevToken from the
    signature altogether.

* All addTransform calls use the lambda form and specify the
  full common signature: (token, prevToken, cb)

* Cleaned up misnamed unused params and removed unused params
  wherever possible.

* This unified signature will now let us use a BlockingSyncTTM
  as an AsyncTTM replacement for use on the PHP side.

Change-Id: Iddb4a3c26

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