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Merge #1681

1681: WIP: Extract subcommands into separate trait r=pksunkara a=CreepySkeleton

Not-yet-working-but-almost-there "multiple traits" approach. More or less done, what's left is to catch some bugs and adapt tests/examples.

For the record: it took so long because of RL stuff (who would have thought?) and because [there was a detailed description of the experience I've had here, but it was deleted because it contained a lot of profanity and emotional notes]. 

As the only person alive that understands how the derive works (if you won't blow your own horn, nobody will do it for you, yeah), I'd like to made a statement: we Do need the refactoring.

Co-authored-by: CreepySkeleton <creepy-skeleton@yandex.ru>

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