Add -j flag for multi-threaded validation #263
Merged
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Only parallelizes test case execution and submission compilation at the moment; input validation could be added with a bit of additional work, but it felt less important to me since it takes almost no time with validators written in C++ as we usually have it.
mypy is happy with the refactoring and I've done some lightweight testing, but it's possible that there's some breakage along less happy paths, though probably restricted to -j.