Update bin/dwhich.dart?

Hey there @bsutton -- getting into all of this.

Could you confirm that dwhich.dart needs to be updated?

It seems to be still using an old Args class from an earlier version of DCLI (3.x.x?)

It also seems that the new ExitException in DCLI 4.x found here:
https://github.com/onepub-dev/dcli/blob/master/dcli_sdk/lib/src/util/exit.dart
or here:
https://github.com/onepub-dev/dcli/blob/master/dcli_sdk/lib/src/util/exceptions.dart

And perhaps a related class here:
https://github.com/onepub-dev/dcli/blob/master/dcli_core/lib/src/util/dcli_exception.dart
and here:
https://github.com/onepub-dev/dcli/blob/master/dcli_core/lib/src/util/run_exception.dart

Let me know if this is relevant/related, happy to get this updated with a bit of direction!

Cheers,
-Tsavo

Beginne mit bin/dwhich.dart und vergleiche die Verwendung von Args und Exceptions mit den in der Issue verlinkten DCLI-4.x-Dateien: dcli_sdk/lib/src/util/exit.dart, dcli_sdk/lib/src/util/exceptions.dart, dcli_core/lib/src/util/dcli_exception.dart und dcli_core/lib/src/util/run_exception.dart. Bestätige, welche APIs veraltet sind, und definiere den Abschluss damit, dass dwhich.dart für die relevanten DCLI-4.x-Schnittstellen aktualisiert wurde.