add cm

[mkinney]

tried to get protobufs working; commented out all cm tests

[codecov]

Codecov Report

Merging #283 (730934f) into master (7fd3b31) will decrease coverage by 4.20%.
The diff coverage is 25.85%.

@@            Coverage Diff             @@
##           master     #283      +/-   ##
==========================================
- Coverage   89.17%   84.96%   -4.21%     
==========================================
  Files          13       13              
  Lines        2060     2202     +142     
==========================================
+ Hits         1837     1871      +34     
- Misses        223      331     +108     

Flag	Coverage Δ
unittests	84.96% <25.85%> (-4.21%)	⬇️

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Impacted Files	Coverage Δ
meshtastic/node.py	70.57% <19.40%> (-29.43%)	⬇️
meshtastic/mesh_interface.py	90.56% <66.66%> (+0.02%)	⬆️
meshtastic/__main__.py	99.34% <100.00%> (+0.01%)	⬆️

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