Add MOA.SilentInner attribute

[odow]

Closes #180

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.76%. Comparing base (8b446ec) to head (dbd78e0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files          12       12           
  Lines        1282     1290    +8     
=======================================
+ Hits         1279     1287    +8     
  Misses          3        3           

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[sandyspiers]

Thanks for this! :)