PR Summary

This adds a new rule: AvoidUsingBrokenHashAlgorithms.

This rule searches for use of SHA-1 or MD5 within -Algorithm parameters. This mainly serves to flag use with Get-FileHash, but also works for other cmdlets which may use the same parameter scheme. Should other algorithms in the future be deemed insecure, it would be trivial to add them.

At this point both of these algorithms are broken (Microsoft SDL has labeled them as such since 2009), so I think it would be worthwhile to flag these, such that new code doesn't use these algorithms except when needed for backwards compatability.

PR Checklist

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