Wrap --help output to 120 characters (#7626)
* Update Clap dependency and remove workarounds * WIP * Remove line breaks in help messages for now * Multiple values can only be separated by commas (closes #7428) * Grumbles; refactor repeating code; add constant * Use a single Wrapper rather than allocate a new one for each call * Wrap --help to 120 characters rather than 100 characters
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