- [x] Get rid of a call to `parser.quote_if_needed()` during solver setup, which
introduces a circular import and also isn't necessary.
- [x] Rename `spack.variant.Value` to `spack.variant.ConditionalValue`, as it is *only*
used for conditional values. This makes it much easier to understand some of the
logic for variant definitions.
Co-authored-by: Harmen Stoppels <me@harmenstoppels.nl>
Signed-off-by: Todd Gamblin <tgamblin@llnl.gov>
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