Fixed SetMessageID message ID generation

[wneessen]

This PR closes #74. It makes sure that generated message IDs via SetMessageID() are truly random and unique

[codecov-commenter]

Codecov Report

Merging #75 (5bf0c10) into main (c321aee) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   84.58%   84.58%           
=======================================
  Files          12       12           
  Lines        1330     1330           
=======================================
  Hits         1125     1125           
  Misses        141      141           
  Partials       64       64           

Impacted Files	Coverage Δ
msg.go	86.41% <100.00%> (ø)

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