- Allow static renderer provided during view registration to be overridden at

  request time via a request attribute named ``override_renderer``, which
  should be the name of a registered renderer.  Useful to provide
  "omnipresent" RPC for existing views.

- Convert ``add_view_mapper`` to ``set_view_mapper``.  There will only be a
  single default view mapper.  We no longer register named utilities for view
  mappers to provide alternates.

- Previoulsy the ``view_mapper`` argument was required to be the *name* of an
  existing registered view mapper.  We no longer register named utilities for
  view mappers, so now if an extension wants to override the view mapper used
  for a particular view registration, it can use the dotted name to a view
  mapper class or provide that class as ``view_mapper``.

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