GUI unit test based on QtTest removed

Tests/UnitTests/CMakeLists.txt

Tests/UnitTests/GUI/CMakeLists.txt

Tests/UnitTests/GUI/GUICoreObjectCorrespondence.h

Tests/UnitTests/GUI/TestComboProperty.h

Tests/UnitTests/GUI/TestComponentProxyModel.h

Tests/UnitTests/GUI/TestComponentUtils.h

Tests/UnitTests/GUI/TestDetectorItems.h

Tests/UnitTests/GUI/TestExternalProperty.h

Tests/UnitTests/GUI/TestFTDistributionItems.h

Tests/UnitTests/GUI/TestFitParameterModel.h

Tests/UnitTests/GUI/TestFormFactorItems.h

Tests/UnitTests/GUI/TestGUI.cpp

Tests/UnitTests/GUI/TestGUICoreObjectCorrespondence.cpp

Tests/UnitTests/GUI/TestGUICoreObjectCorrespondence.h

Tests/UnitTests/GUI/TestGUIHelpers.h

Tests/UnitTests/GUI/TestGroupItem.h

Tests/UnitTests/GUI/TestIntensityDataItem.h

Tests/UnitTests/GUI/TestLayerItems.h

Tests/UnitTests/GUI/TestLayerRoughnessItems.h

Tests/UnitTests/GUI/TestLinkInstrument.h