With this PR:
- Simplifies the `build_machine_pil` function by simply re-parsing a
subset if the PIL. This has the extra advantage that all IDs are
consecutive, which enables supporting STARK backends as well!
- With this approach, it is necessary to have all definitions available,
which makes it necessary to merge `std` namespaces. Those are detected
as namespaces that don't define any column.
- Also, some backends expect at least one witness column and constraint,
so I added a dummy column & constraint for now.
- With this PR, we have everything done for static VadCop! So I added a
test & removed the `should_panic` in an existing test.
82cfdb4bdd