WRG: fix various warning on gcc 8

.../Applications/AppProjection/app/otbOrthoRectification.cxx

Modules/Feature/Edge/include/otbLineSegmentDetector.txx

...es/Feature/Edge/include/otbStreamingLineSegmentDetector.h

.../Feature/Edge/include/otbStreamingLineSegmentDetector.txx

...nipulation/include/otbVectorRescaleIntensityImageFilter.h

...pulation/include/otbVectorRescaleIntensityImageFilter.txx

...jection/src/otbPleiadesPToXSAffineTransformCalculator.cxx

Modules/IO/ImageIO/include/otbImageFileReader.txx

...tion/DisparityMap/include/otbDisparityTranslateFilter.txx

...ingConnectedComponentSegmentationOBIAToVectorDataFilter.h

...gConnectedComponentSegmentationOBIAToVectorDataFilter.txx