Clean up slave interact

lowercasedonkeyrequested to merge
lowercasedonkey/fc-pregmod:new-slave-interact into pregmod-master

Thank you Blank for the tab work, I've copied it and largely kept it the same. Some unintended changes snuck in to that merge so I am reverting it and copying what I need by hand.

si_with_tabs_2.0

This completely replace !6202 (closed).

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