Modernising the code, improving images

src/Cxx/Points/DensifyPoints.cxx

src/Cxx/Points/FitImplicitFunction.cxx

src/Cxx/Points/NormalEstimation.cxx

src/Cxx/Points/PointOccupancy.cxx

src/Cxx/Points/RadiusOutlierRemoval.cxx

src/Cxx/Points/SignedDistance.cxx

src/Cxx/Points/UnsignedDistance.cxx

src/Testing/Baseline/Cxx/Points/TestDensifyPoints.png

src/Testing/Baseline/Cxx/Points/TestDensifyPoints_1.png

src/Testing/Baseline/Cxx/Points/TestDisplayPoints.png

src/Testing/Baseline/Cxx/Points/TestExtractClusters.png

src/Testing/Baseline/Cxx/Points/TestExtractClusters_1.png

src/Testing/Baseline/Cxx/Points/TestExtractClusters_2.png

...Testing/Baseline/Cxx/Points/TestExtractEnclosedPoints.png

src/Testing/Baseline/Cxx/Points/TestExtractPointsDemo.png

src/Testing/Baseline/Cxx/Points/TestExtractSurface.png

src/Testing/Baseline/Cxx/Points/TestExtractSurfaceDemo.png

src/Testing/Baseline/Cxx/Points/TestExtractSurfaceDemo_1.png

src/Testing/Baseline/Cxx/Points/TestFitImplicitFunction.png

src/Testing/Baseline/Cxx/Points/TestMaskPointsFilter.png