Remove deprecated items

[Mingun]

Follow-up for #913. Will be merged after release 0.39.0

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.27%. Comparing base (d1acdb5) to head (6f9c636).
⚠️ Report is 5 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #914      +/-   ##
==========================================
+ Coverage   58.08%   58.27%   +0.18%     
==========================================
  Files          42       42              
  Lines       15513    15463      -50     
==========================================
  Hits         9011     9011              
+ Misses       6502     6452      -50     

Flag	Coverage Δ
unittests	58.27% <ø> (+0.18%)	⬆️

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