Refactor out/* packages

[k1LoW]

No description provided.

[codecov]

Codecov Report

Merging #123 into master will decrease coverage by 0.09%.
The diff coverage is 81.81%.

@@            Coverage Diff            @@
##           master     #123     +/-   ##
=========================================
- Coverage   72.37%   72.27%   -0.1%     
=========================================
  Files          12       12             
  Lines        2534     2525      -9     
=========================================
- Hits         1834     1825      -9     
  Misses        534      534             
  Partials      166      166

Impacted Files	Coverage Δ
output/dot/dot.go	60.65% <100%> (-1.25%)	⬇️
output/plantuml/plantuml.go	63.85% <100%> (-0.86%)	⬇️
output/md/md.go	68.13% <75%> (-0.54%)	⬇️

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