Initial implementation of simradio-based testing with a multi-node simulated mesh

[ianmcorvidae]

When merged this should fix #643 as well. Still adding a bit of stuff to make smokevirt not so useless.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.84%. Comparing base (7a7353c) to head (1cd1aed).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #946   +/-   ##
=======================================
  Coverage   66.84%   66.84%           
=======================================
  Files          25       25           
  Lines        4741     4741           
=======================================
  Hits         3169     3169           
  Misses       1572     1572           

Flag	Coverage Δ
unittests	66.84% <ø> (ø)

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