do not split global app settings in two classes

App/main.cpp

GUI/Application/ApplicationSettings.cpp

GUI/Application/ApplicationSettings.h

GUI/Application/GlobalSettings.cpp

GUI/Application/GlobalSettings.h

GUI/Model/Instrument/InstrumentsTreeModel.cpp

GUI/View/Import/RealDataSelectorWidget.cpp

GUI/View/Import/RealDataTreeModel.cpp

GUI/View/Instrument/InstrumentLibraryEditor.cpp

GUI/View/Intensity/SavePlotAssistant.cpp

GUI/View/Main/ActionManager.cpp

GUI/View/Main/MainWindow.cpp

GUI/View/Main/NewProjectDialog.cpp

GUI/View/Main/ProjectManager.cpp

GUI/View/Main/PyImportAssistant.cpp

GUI/View/MaterialEditor/MaterialEditorDialog.cpp

GUI/View/Projection/SaveProjectionsAssistant.cpp

GUI/View/Realspace/RealSpaceCanvas.cpp

GUI/View/SampleDesigner/LayerOrientedSampleEditor.cpp

GUI/View/SampleDesigner/SampleListView.cpp