Separate geometry and dofs/interpolation

[pmueller2]

Moves coordinate related functionality from MeshFem to the newly created GeometryMeshFem #263 . To construct a MeshFem you always need a GeometryMeshFem.

Is a preparation for the introduction of an interpolation space.

[codecov[bot]]

Codecov Report

Merging #264 into develop will increase coverage by 0.11%. The diff coverage is 99.67%.

@@             Coverage Diff             @@
##           develop     #264      +/-   ##
===========================================
+ Coverage    90.86%   90.98%   +0.11%     
===========================================
  Files          326      334       +8     
  Lines        10906    11067     +161     
===========================================
+ Hits          9910    10069     +159     
- Misses         996      998       +2

Flag	Coverage Δ
#integrationtests	66.73% <83.39%> (+0.27%)	:arrow_up:
#unittests	96.24% <98.88%> (ø)	:arrow_up:

Impacted Files	Coverage Δ
nuto/mechanics/tools/AdaptiveSolve.cpp	96.55% <ø> (ø)	:arrow_up:
nuto/mechanics/iga/Nurbs.h	83.18% <ø> (ø)	:arrow_up:
nuto/mechanics/tools/NodalValueMerger.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/elements/ElementInterface.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/mesh/MeshFem.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/constraints/Constraints.cpp	95.09% <ø> (ø)	:arrow_up:
nuto/mechanics/constraints/ConstraintCompanion.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/cell/CellData.h	100% <ø> (ø)	:arrow_up:
test/mechanics/iga/Nurbs.cpp	100% <100%> (ø)	:arrow_up:
test/mechanics/integrands/GradientDamage.cpp	100% <100%> (ø)	:arrow_up:
... and 55 more

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