2583 - start maintaining refcounts

Also start auto-abandoning addresses when their refcount returns to 0.

I'm mixing this auto-abandon support with my earlier/hackier support for
automatically abandoning default-space created by 'local-scope'. We need
to flesh out the story for automatically reclaiming memory using
C++-style destructors.

But that's a value-add. Memory corruption is far more important to avoid
than memory *leaks*.

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