Create a script to translate problem packages from legacy version

[niemela]

See also RagnarGrootKoerkamp/BAPCtools#295

[niemela]

The translator should:

1. Determine if it is possible to translate. The main reasons for why it wouldn't be is if a grader was used or a validator is written in a language son supported in the new version.
2. If it is not possible, explain why.
3. If it is possible, do it. :).

I think it should/could assume that a given package is "correct". I.e. package validation is a separate tool.

It might also be somewhat useful to support translation between every pair of versions, but translating from the new to the old would of course have many more potential to not be possible.

[niemela]

@sjoqvist