Add structured exceptions to decorators and remaining functions.

* Use explicit StopIteration to pass information from generators to
  raise_if_nothing_inferred and path_wrapper, rather than return or
  implicit termination by reaching the end of the code block.

* Remove remove_nodes in favor of handling the cases in local_attr,
  istance_attr, and getattr, to avoid the need for complicated
  information passing when needing to raise an exception.

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