file name -> usual camel case form

Tests/UnitTests/GUI/TestComboProperty.cpp

Tests/UnitTests/GUI/TestComponentProxyModel.cpp

Tests/UnitTests/GUI/TestDataItemViews.cpp

Tests/UnitTests/GUI/TestExternalProperty.cpp

Tests/UnitTests/GUI/TestGroupItem.cpp

Tests/UnitTests/GUI/TestLinkInstrument.cpp

Tests/UnitTests/GUI/TestOutputDataIOService.cpp

Tests/UnitTests/GUI/TestProjectDocument.cpp

Tests/UnitTests/GUI/TestSaveService.cpp

Tests/UnitTests/GUI/TestSavingSpecularData.cpp

Tests/UnitTests/GUI/Utils.cpp

Tests/UnitTests/GUI/Utils.h