ENH: adding the average elevation possibility to the VectorDataProjectionFilter

Code/Projections/otbForwardSensorModel.txx

Code/Projections/otbGenericRSTransform.h

Code/Projections/otbGenericRSTransform.txx

Code/Projections/otbInverseSensorModel.txx

Code/Projections/otbSensorModelBase.txx

Code/Projections/otbVectorDataProjectionFilter.h

Code/Projections/otbVectorDataProjectionFilter.txx