ENH: add more parameter types, and begin a more complex example

Code/Core/otbWrapperApplication.h

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/otbWrapperOutputImageParameter.h

Code/Core/otbWrapperOutputVectorDataParameter.h

Code/Core/otbWrapperParameter.h

Code/Core/otbWrapperParameterGroup.h

Code/Core/otbWrapperRadiusParameter.h

Code/Core/otbWrapperStringParameter.h

Code/Wrappers/QtWidget/CMakeLists.txt

Code/Wrappers/QtWidget/otbWrapperQtWidgetChoiceParameter.cxx

Code/Wrappers/QtWidget/otbWrapperQtWidgetChoiceParameter.h

...appers/QtWidget/otbWrapperQtWidgetInputImageParameter.cxx

...Wrappers/QtWidget/otbWrapperQtWidgetInputImageParameter.h