ENH: simplify the parameter creation

Code/Core/otbWrapperApplication.cxx

Code/Core/otbWrapperApplication.h

Code/Core/otbWrapperChoiceParameter.cxx

Code/Core/otbWrapperChoiceParameter.h

Code/Core/otbWrapperDirectoryParameter.h

Code/Core/otbWrapperEmptyParameter.h

Code/Core/otbWrapperFilenameParameter.h

Code/Core/otbWrapperInputComplexImageParameter.h

Code/Core/otbWrapperInputImageParameter.h

Code/Core/otbWrapperInputVectorDataParameter.h

Code/Core/otbWrapperNumericalParameter.h

Code/Core/otbWrapperParameter.h

Code/Core/otbWrapperParameterGroup.cxx

Code/Core/otbWrapperParameterGroup.h

Code/Core/otbWrapperRadiusParameter.h

Code/Core/otbWrapperStringParameter.h

Code/Wrappers/QtWidget/otbWrapperQtWidgetChoiceParameter.cxx

Example/Smoothing/otbSmoothing.cxx

Testing/Core/otbWrapperApplicationFactoryTest.cxx

Testing/QtWidget/otbWrapperQtWidgetParameterFactory.cxx