fix: unify file flags

[stefanschramm]

find . -executable -type f | grep -v "^./.git/hooks" reveals some files that have the executable bit set. I guess this is not necessary.

[artonge]

@stefanschramm can you fix DCO?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.36%. Comparing base (5e7b446) to head (7c22780).
Report is 123 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1806      +/-   ##
==========================================
- Coverage   31.54%   31.36%   -0.18%     
==========================================
  Files          43       43              
  Lines        1620     1629       +9     
  Branches      110      110              
==========================================
  Hits          511      511              
- Misses       1083     1092       +9     
  Partials       26       26              

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[artonge]

Thanks @stefanschramm :)

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