Add Message::trace() + Minor refactoring

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.55%. Comparing base (c53b9a9) to head (f1180b8).

❗ Current head f1180b8 differs from pull request most recent head 0514c5c

Please upload reports for the commit 0514c5c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #113   +/-   ##
=========================================
  Coverage     99.54%   99.55%           
  Complexity      161      161           
=========================================
  Files            10       10           
  Lines           444      446    +2     
=========================================
+ Hits            442      444    +2     
  Misses            2        2           

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