Snapshot regression testing #245
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This PR introduces Cargo insta for snapshot testing.
I started by moving the branescript and bakery tests from the unit test section to a integration test section and then added snapshot testing on top of it.
Note that this is purely regression testing, for all I know all parsing is done incorrectly now, it it just self-consistent with previous results.
Not of particular interest for this PR, but we also need negative testing for branescript to make sure a nom update for example does not mess with error reporting