Rename 'Detector' to 'SphericalDetector'

Core/Algorithms/inc/Instrument.h

Core/Algorithms/inc/SphericalDetector.h

Core/Algorithms/src/Instrument.cpp

Core/Algorithms/src/SimulationElement.cpp

Core/Algorithms/src/SphericalDetector.cpp

Core/PythonAPI/inc/PythonCoreList.h

Core/PythonAPI/inc/SphericalDetector.pypp.h

Core/PythonAPI/src/PythonModule.cpp

Core/PythonAPI/src/SphericalDetector.pypp.cpp

GUI/coregui/Models/TransformFromDomain.cpp

Tests/UnitTests/TestCore/DetectorMaskTest.h

Tests/UnitTests/TestCore/DetectorTest.h

dev-tools/python-bindings/settings_core.py