Improve and refactor Autofill heuristics (#905)

* Add support for `AUTOFILL_HINT_NEW_PASSWORD` and
  `AUTOFILL_HINT_NEW_USERNAME`. This allows apps to trigger a
  `ClassifiedScenario` with only a generate password action and is the
  analogue of the W3C new-password hint for websites.
* Do not consider HTML password fields without hints to be certain
  password fields (they could contain e.g. bank account numbers,
  API secrets,...).
* Reduce OTP field false positives by excluding the term "postal" as well
  as fields that match the "code" heuristic term but have HTML maxLength
  less than 6 or larger than 8.
* Add German heuristic term "einmal" ("one-time") for OTP fields
* Also exclude fields based on their HTML name (e.g. for terms such as
  "search").
* Extract fieldId, hint and htmlName matches into an extension property.
* Reduce warnings and remove unnecessary suppression annotations.

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