Refactoring in IO of IAxis.

Core/Algorithms/src/Detector.cpp

Core/PythonAPI/inc/PythonCoreList.h

Core/Tools/inc/ConstKBinAxis.h

Core/Tools/inc/FixedBinAxis.h

Core/Tools/inc/IsGisaxsAxis.h

Core/Tools/inc/OutputDataIOHelper.h

Core/Tools/inc/VariableBinAxis.h

Core/Tools/src/ConstKBinAxis.cpp

Core/Tools/src/IsGisaxsAxis.cpp

Core/Tools/src/OutputDataIOHelper.cpp

Tests/UnitTests/TestCore/ConstKBinAxisTest.h

Tests/UnitTests/TestCore/FixedBinAxisTest.h

Tests/UnitTests/TestCore/VariableBinAxisTest.h