rm GUI/Items, all files moved to GUI/Models

GUI/Mapper/ComponentProxyModel.cpp

GUI/Mapper/ComponentProxyStrategy.cpp

GUI/Mapper/ComponentUtils.cpp

GUI/Mapper/ModelMapper.cpp

GUI/Mapper/ModelUtils.cpp

GUI/Mapper/ProxyModelStrategy.cpp

GUI/Models/Data/ApplicationModels.cpp

GUI/Models/Data/AxesItems.cpp

GUI/Models/Data/AxesItems.h

GUI/Models/Data/Data1DViewItem.cpp

GUI/Models/Data/Data1DViewItem.h

GUI/Models/Data/DataItem.cpp

GUI/Models/Data/DataItem.h

GUI/Models/Data/DataItemUtils.cpp

GUI/Models/Data/DataItemUtils.h

GUI/Models/Data/DataProperties.cpp

GUI/Models/Data/DataProperties.h

GUI/Models/Data/DataPropertyContainer.cpp

GUI/Models/Data/DataPropertyContainer.h

GUI/Models/Data/DataViewUtils.cpp