Merge pull request #27520 from mantidproject/Fix_various_gcc_warnings

Framework/Algorithms/src/CreateDetectorTable.cpp

...work/Algorithms/test/CalculatePlaczekSelfScatteringTest.h

Framework/Algorithms/test/CreateDetectorTableTest.h

Framework/Crystal/test/IndexPeaksTest.h

Framework/DataHandling/test/LoadNGEMTest.h

Framework/Geometry/test/CSGObjectTest.h

Framework/Geometry/test/MeshObjectTest.h

Framework/NexusGeometry/test/JSONInstrumentBuilderTest.h

Framework/NexusGeometry/test/NexusGeometrySaveTest.h

...rk/PythonInterface/mantid/kernel/src/Exports/Material.cpp

MantidPlot/CMakeLists.txt

buildconfig/CMake/Eigen.cmake

buildconfig/CMake/Eigen.in

buildconfig/CMake/SipQtTargetFunctions.cmake

buildconfig/CMake/Span.cmake

buildconfig/CMake/Span.in

.../ISISReflectometry/GUI/MainWindow/MainWindowPresenter.cpp

...ntific_interfaces/Indirect/IndirectFitPropertyBrowser.cpp

..._interfaces/test/ISISReflectometry/Common/ClipboardTest.h