- Now is a separated filter type (`var_rename`).
- Now all variants support a `pre_transform` filter list.
- An internal `_var_rename` filter is defined (default).
- Now they behave more coherently across outputs.
- Component status is explicitly reset, so having a variant + filter
behaves in a more consistent way. Even when this isn't the
recommended use.
- Virtual components are handled by the exclude filter.
- Moved code to modify the PCB to VariantOptions.
- Added a real virtual component to the tests, not a ridiculous case.
So they have the same functionality than internal BoM.
I keep the (redundant) filters in internal BoM so users doesn't need to
create a variant just to apply a filter.
Salvador E. Tropea