refactor: convert schema:regenerate command to yargs

[rossiam]

• converted schema:regenerate to yargs
• updated associated unit tests
• fixed a couple of other minor issues I noticed along the way (in particular, examples for presentation:device-config command)

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[Sitlintac]

Good catch!

[Sitlintac]

Can/should we repeat the warning about the old values being invalidated (and thus potentially breaking any existing installations) here as well? Not everyone takes the time to read documentation.

[rossiam]

That's a good idea but putting it here would only help those who use it in Q&A mode. I think it it would be better prompt for confirmation with the warning. I wrote an issue for it though since that's a bit more than a refactor (even though it is pretty simple).