2692 - all memory leaks fixed

To find this I spent some time trying to diagnose when it happened but
there was no seeming pattern. I'd ended up with a small single-file .cc
and single-file .mu that reproduced one memory leak. Eventually I tried
deleting all type_tree and string_tree from it, and lo the leaks
vanished. I retried on all of edit (just loading), and the leaks
remained gone. At that point I switched tack and started looking at all
the core methods of these classes.

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