Remove deprecated items

[Mingun]

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

[codecov-commenter]

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 58.27%. Comparing base (d1acdb5) to head (6f9c636). :warning: Report is 7 commits behind head on master. :exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

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%)	:arrow_up:

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