ENH : put the functor in a standalone file : Bindings needs

Code/ChangeDetection/otbCBAMI.h

Code/ChangeDetection/otbCBAMIChangeDetector.h

Code/ChangeDetection/otbCorrelationChangeDetector.h

Code/ChangeDetection/otbCrossCorrelation.h

Code/ChangeDetection/otbJoinHistogramMI.h

Code/ChangeDetection/otbJoinHistogramMIImageFilter.h

Code/ChangeDetection/otbLHMI.h

Code/ChangeDetection/otbLHMIChangeDetector.h

Code/ChangeDetection/otbMeanDifference.h

Code/ChangeDetection/otbMeanDifferenceImageFilter.h

Code/ChangeDetection/otbMeanRatio.h

Code/ChangeDetection/otbMeanRatioImageFilter.h