Auto-detect packages that use multiple threads#31
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To properly fork our template process and avoid deadlocks in the launched children, we need to ensure that no dependencies instantiate threads during import. Most known offenders are the numerical computation packages like numpy; but not all of them.
This PR auto-scans for packages that do launch threads in a throwaway process before we start to build up the base package. This ensures that these dependencies are left for the last mile after fork.