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This implements the simple version of a wizard with no sub-steps, called the finite wizard. There is a finite wizard component, and then that component is combined with a modal to make demos showing an example wizard flow.
It is dependent on the sequence, which is still under some discussion, but I would like to start getting this reviewed. Having it out there will help to understand the sequence issues as well.
Please expect that the sequence will be updated when it settles. Comments about the sequence are probably best kept in the sequence PR #849
Fixes #185