Support collecting all unrecognized arguments after parsing known args #348
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Addresses #171
Prior to this, the only options were to treat all unrecognized arguments as fatal errors, or to treat them as the beginning of a list of unrecognized args.
This allows a new, third way to handle unrecognized arguments. Regardless of order, all recognized arguments are parsed and the unrecognized ones will be made available in CommandLineApplication. RemainingArguments.