Make go run fast #2
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This speeds up the validity checking in the go solver, and adds a main function so that it can be used directly.
The speedup comes from avoiding more memory allocations and string building, by replacing the binary string check with a count of the leading zeroes of the first 8 hash bytes as uint64 (big endian).
This breaks for difficulty > 64, but that is out of range for any reasonable PoW either way.