Remove most Datetime panic paths #10
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This change removes most panic paths from the Datetime type. Additionally, it adds some tests that exercise every date for the next hundred years or so to catch any date-specific bugs.
There are still a couple expects() in the chrono conversion path because we know about some invariants that the compiler can't really know about, but those are all behind a feature flag. TBD if it's possible to remove those without using unsafe code.