Update mastermind semver

[xmattstrongx]

Initial start of PR for #562 . Integration tests failing. Looking in to them

[xmattstrongx]

All checks green, though I am not confident on the resolution. Changed an failing deep equals check on an error type to a check of the equivalence of the error type's strings. Also modified test data. Unclear what the mode in the test hardness cases is derived from.

[sdboyer]

Ahh, ok, yes - I now remember why this is happening the way it is. The old version of semver we were on had only halfway converted the below-1.0.0 handling of carets - the parser was still doing the old thing, but the stringifier had the new logic. As a result, ^0.8.0 would be parsed as "greater than or equal to 0.8.0 and less than 1.0.0" - but in the new model, that stringifies to >=0.8.0, < 1.0.0.

This all happens in the test output as it does because we prepend the caret.

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