add mechanic for fuzzing subcommands, and several fixes for found issues
from longer fuzzer runs
This includes some issues with option group positional name ambiguity, issue with join multioption policy and config files, and a few edge cases for configuration of multiline output interpretation.
Also added complex variables to the options, no issues found from this addition.
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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