Masks are added to the detector

Core/Algorithms/inc/Detector.h

Core/Algorithms/inc/DetectorMask.h

Core/Algorithms/inc/GISASSimulation.h

Core/Algorithms/inc/Instrument.h

Core/Algorithms/src/Detector.cpp

Core/Algorithms/src/DetectorMask.cpp

Core/Algorithms/src/GISASSimulation.cpp

Core/Algorithms/src/OffSpecSimulation.cpp

Core/PythonAPI/src/Detector.pypp.cpp

Core/PythonAPI/src/GISASSimulation.pypp.cpp

Core/PythonAPI/src/Instrument.pypp.cpp

Core/PythonAPI/src/IntensityData.pypp.cpp

Core/Tools/src/PyGenVisitor.cpp

GUI/coregui/Models/TransformFromDomain.cpp

Tests/UnitTests/TestCore/DetectorMaskTest.h

Tests/UnitTests/TestCore/GISASSimulationTest.h

dev-tools/log/perf_history.txt