Utilize spawn or forkserver instead of fork for multiprocessing module

Due to new security features in OS X Mojave, we should look into using the spawn or forkserver process instead of fork when creating child processes.

This is documented in: https://bugs.python.org/issue33725

Another workaround is to set the environment variable: export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

However, I think it may be easier/better long-term to use:

multiprocessing.set_start_method(&#39;spawn&#39;)

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