Pull fixes from python_wrapper branch

[SamFlt]

Fix for some issues:

• undefined symbols
• Missing template specializations for vpRGBf in vpImage
• Some access issues related to the introduction of json in ViSP

[codecov]

Codecov Report

Patch coverage: 62.26% and project coverage change: -0.01% ⚠️

Comparison is base (fed5b91) 54.43% compared to head (a15411f) 54.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1232      +/-   ##
==========================================
- Coverage   54.43%   54.42%   -0.01%     
==========================================
  Files         404      404              
  Lines       49843    49848       +5     
==========================================
  Hits        27130    27130              
- Misses      22713    22718       +5     

Files Changed	Coverage Δ
modules/core/include/visp3/core/vpColVector.h	78.72% <0.00%> (ø)
...ules/core/include/visp3/core/vpHomogeneousMatrix.h	100.00% <ø> (ø)
modules/core/include/visp3/core/vpPoseVector.h	80.00% <ø> (ø)
modules/core/include/visp3/core/vpRowVector.h	79.31% <ø> (ø)
modules/core/src/math/matrix/vpColVector.cpp	69.32% <0.00%> (-0.83%)	⬇️
modules/core/src/math/matrix/vpRowVector.cpp	65.40% <0.00%> (+0.29%)	⬆️
...nclude/visp3/visual_features/vpFeaturePointPolar.h	0.00% <ø> (ø)
...l_features/src/visual-feature/vpFeatureEllipse.cpp	72.41% <0.00%> (-0.42%)	⬇️
modules/vs/src/vpServoData.cpp	0.00% <0.00%> (ø)
...re/src/math/transformation/vpTranslationVector.cpp	51.46% <20.00%> (+0.29%)	⬆️
... and 7 more

... and 2 files with indirect coverage changes

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