Final fixes for OpenCV >= 3.4.7

examples/Demo2.cpp

src/algorithms/DPAdaptiveMedian.cpp

src/algorithms/DPAdaptiveMedian.h

src/algorithms/DPEigenbackground.cpp

src/algorithms/DPEigenbackground.h

src/algorithms/DPGrimsonGMM.cpp

src/algorithms/DPMean.cpp

src/algorithms/DPPratiMediod.cpp

src/algorithms/DPTexture.cpp

src/algorithms/DPWrenGA.cpp

src/algorithms/DPZivkovicAGMM.cpp

src/algorithms/FuzzyChoquetIntegral.cpp

src/algorithms/FuzzySugenoIntegral.cpp

src/algorithms/IMBS/IMBS.cpp

src/algorithms/IMBS/IMBS.hpp

src/algorithms/KNN.cpp

src/algorithms/KNN.h

src/algorithms/LBAdaptiveSOM.cpp

src/algorithms/LBFuzzyAdaptiveSOM.cpp

src/algorithms/LBFuzzyGaussian.cpp