Support super-classes in root-instances

[sellout]

I would like to be able to use something like

root-instances = [ { super-classes = ['\.TypeError .*'] } ]

to allow me to have TypeError-constrained instances without having to individually add the instances.

I’m imagining the super-classes list being &&ed together, so that all of the listed constraints must exist for it to be allowed.

TypeError is the only use case I can think of for this, but my guess is that something more general is the same level of effort.

[sellout]

I just realized I can match this with

root-instances = [
    {instance = '''^(.*TypeError .*) => .*'''},
]