Better sampling; OutProbs()

Multi-shot measurement in QEngine was previously handled in a way that was technically not thread-safe for C++. This has been fixed, and QEngine sampling has been parallelized further.

The OutProbs() method has been added to the shared library extern C API, which returns the L2 norm of each OutKet() amplitude in same order.

Full Changelog: vm6502q.v9.9.62...vm6502q.v9.10.0

sha1sum results:
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