Improve code quality by fixing issues reported by Sonarqube

[fspindle]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 47.48011% with 198 lines in your changes missing coverage. Please review.

Project coverage is 53.82%. Comparing base (c60ddae) to head (2df7042).
Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/core/src/image/vpImageConvert.cpp	3.84%	50 Missing ⚠️
modules/core/src/image/vpImageConvert_yuv.cpp	0.00%	18 Missing ⚠️
modules/core/src/tools/geometry/vpRectOriented.cpp	0.00%	16 Missing ⚠️
...re/src/math/transformation/vpHomogeneousMatrix.cpp	50.00%	14 Missing ⚠️
modules/core/src/image/vpCannyEdgeDetection.cpp	0.00%	12 Missing ⚠️
...ore/src/math/transformation/vpForceTwistMatrix.cpp	20.00%	12 Missing ⚠️
...dules/core/src/math/matrix/vpMatrix_operations.cpp	10.00%	9 Missing ⚠️
...ules/core/src/math/transformation/vpRzyxVector.cpp	33.33%	6 Missing ⚠️
...ules/core/src/math/transformation/vpRzyzVector.cpp	33.33%	6 Missing ⚠️
...es/core/src/math/transformation/vpThetaUVector.cpp	66.66%	6 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1510      +/-   ##
==========================================
- Coverage   53.82%   53.82%   -0.01%     
==========================================
  Files         442      442              
  Lines       53850    53869      +19     
==========================================
+ Hits        28987    28995       +8     
- Misses      24863    24874      +11     

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