Rename src/ to nuto/

[Psirus]

As discussed in the meeting, this will rename src/ to nuto/, and the includes change from #include "base/Whatever.h" to #include "nuto/base/Whatever.h".

[codecov[bot]]

Codecov Report

Merging #222 into PDE_reviewed will not change coverage. The diff coverage is n/a.

@@              Coverage Diff              @@
##           PDE_reviewed     #222   +/-   ##
=============================================
  Coverage         83.89%   83.89%           
=============================================
  Files               291      291           
  Lines             10380    10380           
=============================================
  Hits               8708     8708           
  Misses             1672     1672

Flag	Coverage Δ
#integrationtests	60.47% <ø> (ø)	:arrow_up:
#unittests	81.75% <ø> (ø)	:arrow_up:

Impacted Files	Coverage Δ
nuto/visualize/AverageHandler.cpp	89.74% <ø> (ø)
nuto/mechanics/elements/ElementInterface.h	100% <ø> (ø)
...o/mechanics/integrationtypes/IntegrationTypeBase.h	100% <ø> (ø)
nuto/visualize/Cell.cpp	83.33% <ø> (ø)
nuto/mechanics/constitutive/EngineeringStress.h	100% <ø> (ø)
nuto/visualize/Cell.h	100% <ø> (ø)
nuto/math/EigenSparseSolve.h	100% <ø> (ø)
...uto/mechanics/integrationtypes/IntegrationType3D.h	0% <ø> (ø)
...ics/integrationtypes/IntegrationType0DBoundary.cpp	0% <ø> (ø)
nuto/mechanics/elements/SpectralShapeFunctions.cpp	99.16% <ø> (ø)
... and 206 more

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[Psirus]

For same directory, I'd just use the #include "Stuff.h". For everything else, I think #include "nuto/math/stuff/Stuff.h" is fine. Personally, I don't like #include ../stuff2/OtherStuff.h", but in the end, not important.

As for when to change: when you're writing new code or touching it anyway and it bothers you. No need to go over everything to "fix" it, imho.