[converted to !2336] Nodes SetMimir

Multipartiterequested to merge
Multipartite/thornode:nodes-setmimir into develop

Intended for Issue #1343 (closed).

As my first logic-changing Merge Request, this surely has areas which should be changed.
All feedback is welcome.

(Edit: Closed in favour of !2336 (merged).)

Edited by Multipartite

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