Removed IsGISAXS morphology file implementation

Core/Algorithms/inc/InterferenceFunctionStrategies.h

Core/Algorithms/inc/IsGISAXSMorphologyFileStrategy.h

Core/Algorithms/src/IsGISAXSMorphologyFileStrategy.cpp

Core/Algorithms/src/LayerStrategyBuilder.cpp

Core/PythonAPI/src/ILayout.pypp.cpp

Core/Samples/inc/ILayout.h

Core/StandardSamples/CustomMorphologyBuilder.cpp

Core/Tools/src/PyGenVisitor.cpp

Tests/FunctionalTests/TestPyCore/isgisaxs07.py

Tests/ReferenceData/BornAgain/isgisaxs07_reference.int.gz

Tests/ReferenceData/BornAgain/ref_CustomMorphology.int.gz