AthContainers, etc: Move auxid to the IAuxTypeVector base class.
Move auxid to the IAuxTypeVector base class where we can access it via an inlined method, rather than using a virtual method. This is moving towards packed links / jagged vectors.
Move auxid to the IAuxTypeVector base class where we can access it via an inlined method, rather than using a virtual method. This is moving towards packed links / jagged vectors.