Missing core features

[olivernybroe]

Right now drift is not complete at all, there are still a bunch of features which it cannot migrate.

Here is a list of it, so we know what we need to work on before having "complete" refactor. (if something is missing, just edit the list and add it or post a comment and I'll add it)

• [ ] Data providers
• [ ] Exception throwing
• [ ] Helper methods
• [ ] Skipping tests
• [ ] setUp/tearDown
• [ ] beforeClass/afterClass
• [ ] Migrate traits to uses statements