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RPC: revise semantics for weak references and object IDs

Nick Mathewson requested to merge nickm/arti:rpc-objectmap into main

Now:

  • Strong references (handles) and weak references (references) are kept in separate arenas.
  • The ObjectIds we return are even more opaque, to prevent accidental misuse even more.
  • Inserting the same Arc as a strong reference twice returns two different handles.
  • Inserting the same Arc as a weak reference twice returns the same reference, encoded in two different ways to prevent misuse.
  • Our docs are a little more accurate.

Closes #848 (closed).

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