Use C++20

[dweindl]

Require C++20 and use std::ranges.

[codecov]

Codecov Report

Attention: Patch coverage is 82.75862% with 10 lines in your changes missing coverage. Please review.

Project coverage is 77.85%. Comparing base (a87058e) to head (da9ab17).

Files with missing lines	Patch %	Lines
src/edata.cpp	28.57%	5 Missing ⚠️
src/forwardproblem.cpp	50.00%	3 Missing ⚠️
include/amici/forwardproblem.h	66.66%	1 Missing ⚠️
src/model.cpp	95.23%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2660      +/-   ##
===========================================
- Coverage    77.86%   77.85%   -0.02%     
===========================================
  Files          332      332              
  Lines        23001    23013      +12     
  Branches      1480     1479       -1     
===========================================
+ Hits         17909    17916       +7     
- Misses        5081     5086       +5     
  Partials        11       11              

Flag	Coverage Δ
cpp	74.79% <82.75%> (-0.01%)	⬇️
cpp_python	33.57% <53.44%> (-0.04%)	⬇️
petab	39.37% <40.74%> (-0.04%)	⬇️
python	72.89% <81.03%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
src/amici.cpp	79.16% <ø> (ø)
src/hdf5.cpp	86.61% <100.00%> (+0.30%)	⬆️
src/model_dae.cpp	33.91% <100.00%> (ø)
src/model_ode.cpp	70.81% <100.00%> (ø)
src/rdata.cpp	95.62% <100.00%> (+<0.01%)	⬆️
src/solver.cpp	80.04% <100.00%> (-0.03%)	⬇️
src/splinefunctions.cpp	79.12% <100.00%> (ø)
src/steadystateproblem.cpp	85.31% <100.00%> (ø)
src/sundials_matrix_wrapper.cpp	83.69% <100.00%> (ø)
src/vector.cpp	88.04% <100.00%> (ø)
... and 4 more

... and 4 files with indirect coverage changes

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[FFroehlich]

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