[WIP] Parse Separations and Mixer archetypes properly#23

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nuclearkatie wants to merge 5 commits intocnerg:mainfrom nuclearkatie:parse_input

+158-17

Commits on Mar 30, 2021

Commits on Apr 12, 2021

commod dict can find nested commodities (aka streams)
nuclearkatie
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Commits on Apr 15, 2021

update tests
nuclearkatie
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