Create only one NuTo lib

[Psirus]

What used to be Base, Math, GeometryConcrete, Mechanics and Visualize are merged into one. This makes the cmake code a bit simpler and also allows linking simply using -lnuto.

Currently, a lot of the visualize unit tests link to NuTo. So either we change these tests, or move them to integrationtests, or ...?

[codecov[bot]]

Codecov Report

Merging #221 into PDE_reviewed will increase coverage by 0.01%. The diff coverage is 100%.

@@               Coverage Diff                @@
##           PDE_reviewed     #221      +/-   ##
================================================
+ Coverage         84.22%   84.23%   +0.01%     
================================================
  Files               295      295              
  Lines             10653    10653              
================================================
+ Hits               8972     8974       +2     
+ Misses             1681     1679       -2

Flag	Coverage Δ
#integrationtests	62.5% <100%> (+1.23%)	:arrow_up:
#unittests	87.6% <ø> (+5.42%)	:arrow_up:

Impacted Files	Coverage Δ
...ions/integrationtests/visualize/VoronoiHandler.cpp	100% <ø> (ø)
nuto/base/Logger.cpp	30% <ø> (ø)	:arrow_up:
...ations/integrationtests/visualize/MeshFunction.cpp	100% <ø> (ø)
...ications/integrationtests/visualize/Visualizer.cpp	100% <ø> (ø)
...ions/integrationtests/visualize/AverageHandler.cpp	100% <ø> (ø)
...cations/integrationtests/visualize/TestStructure.h	100% <ø> (ø)
...cations/integrationtests/visualize/PostProcess.cpp	100% <ø> (ø)
...ations/integrationtests/visualize/PointHandler.cpp	100% <100%> (ø)
nuto/visualize/PointHandler.cpp	80% <0%> (+6.66%)	:arrow_up:

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