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

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.79%. Comparing base (7a7353c) to head (15438c8).

Files with missing lines	Patch %	Lines
meshtastic/node.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
- Coverage   66.84%   66.79%   -0.05%     
==========================================
  Files          25       25              
  Lines        4741     4743       +2     
==========================================
- Hits         3169     3168       -1     
- Misses       1572     1575       +3     

Flag	Coverage Δ
unittests	66.79% <0.00%> (-0.05%)	⬇️

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