Some misc C++20 cleanups

[LebedevRI]

No description provided.

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (4fa2d5f) 58.85% compared to head (d4fbebc) 58.88%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #551      +/-   ##
===========================================
+ Coverage    58.85%   58.88%   +0.02%     
===========================================
  Files          234      234              
  Lines        13902    13887      -15     
  Branches      1942     1938       -4     
===========================================
- Hits          8182     8177       -5     
+ Misses        5599     5593       -6     
+ Partials       121      117       -4     

Flag	Coverage Δ
benchmarks	8.35% <4.95%> (+0.16%)	⬆️
integration	47.45% <50.87%> (-0.02%)	⬇️
linux	56.80% <53.78%> (+<0.01%)	⬆️
macOS	18.66% <25.43%> (+0.04%)	⬆️
rpu_u	47.45% <50.87%> (-0.02%)	⬇️
unittests	17.53% <34.71%> (-0.54%)	⬇️
windows	∅ <ø> (∅)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/librawspeed/adt/BitIterator.h	0.00% <ø> (ø)
src/librawspeed/adt/NORangesSet.h	88.88% <100.00%> (+5.55%)	⬆️
src/librawspeed/adt/Point.h	72.15% <ø> (-0.69%)	⬇️
src/librawspeed/codes/AbstractPrefixCodeDecoder.h	54.05% <100.00%> (-1.21%)	⬇️
src/librawspeed/codes/HuffmanCode.h	75.40% <100.00%> (ø)
src/librawspeed/common/Common.h	87.95% <100.00%> (-0.15%)	⬇️
src/librawspeed/decoders/Cr2Decoder.cpp	56.36% <100.00%> (ø)
src/librawspeed/decoders/CrwDecoder.cpp	69.16% <100.00%> (ø)
...rawspeed/decompressors/AbstractDngDecompressor.cpp	24.21% <ø> (ø)
...c/librawspeed/decompressors/AbstractLJpegDecoder.h	86.66% <100.00%> (ø)
... and 35 more

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.