[Cython] Safer exception handling

[Robert Bradshaw]

One of the pain points in Cython is that one must explicitly annotate
non-object returning functions with except clauses. Would it be worth
trying to change the default here, making exception-suppressing opt-in
rather than opt-out?

There are a couple of open questions, e.g.
  * What would the syntax be?
  * What about extern functions?
  * What would the performance impact be? Could it be mitigated?
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