Output full command-line arguments from interactive mode

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The upcoming interactive mode is going to make it significantly easier for people unfamiliar with the tool to get it running. I'd love to see the equivalent command-line arguments the user chose output to the console for future reference.

This would give someone the ability to use the interactive mode to build their support diagnostics command, and make it much simpler to re-run the same options on a subsequent tries (say after a configuration change so we can compare results).

Having a "build only" flag could also be useful. So you can use the interactive mode to build your command, but only print it (not run it).