Semi-automatic code cleanup

[annejan]

Using clang-tidy, clang-format and clazy

This might break compatibility with older linux distro's . .

[codecov]

Codecov Report

Merging #425 into master will decrease coverage by <.01%.
The diff coverage is 4.1%.

@@            Coverage Diff            @@
##           master    #425      +/-   ##
=========================================
- Coverage    7.13%   7.13%   -0.01%     
=========================================
  Files          43      44       +1     
  Lines        2775    2776       +1     
=========================================
  Hits          198     198              
- Misses       2577    2578       +1

Impacted Files	Coverage Δ
src/pass.cpp	4.61% <ø> (ø)	⬆️
src/qpushbuttonasqrcode.h	0% <ø> (ø)	⬆️
src/settingsconstants.cpp	100% <ø> (+1.88%)	⬆️
src/singleapplication.h	0% <ø> (ø)	⬆️
src/keygendialog.h	0% <ø> (ø)	⬆️
src/trayicon.h	0% <ø> (ø)	⬆️
src/imitatepass.h	40% <ø> (+15%)	⬆️
src/mainwindow.cpp	0% <0%> (ø)	⬆️
src/singleapplication.cpp	0% <0%> (ø)	⬆️
src/configdialog.cpp	0% <0%> (ø)	⬆️
... and 18 more

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[coveralls]

Coverage increased (+0.06%) to 7.321% when pulling 757f115 on clang-tidy-clazy into 32ea1ad on master.

[coveralls]

Coverage decreased (-0.1%) to 7.024% when pulling d483e98 on clang-tidy-clazy into 0789259 on master.