Use std::filesystem

source/ArmarXGui/applications/ArmarXGui/ArmarXMainWindow.cpp

...Gui/applications/ArmarXGui/Widgets/GuiUseCaseSelector.cpp

...ui/applications/ArmarXGui/Widgets/UseCaseSelectorItem.cpp

source/ArmarXGui/applications/ArmarXGui/main.cpp

...ui/gui-plugins/LoggingPlugin/ArmarXLogViewer/LogTable.cpp

source/ArmarXGui/gui-plugins/PlotterPlugin/ArmarXPlotter.cpp

...ui-plugins/StatechartEditorPlugin/StateTreeController.cpp

...ins/StatechartEditorPlugin/StatechartEditorController.cpp

...ui-plugins/StatechartEditorPlugin/cloning/GroupCloner.cpp

.../gui-plugins/StatechartEditorPlugin/io/GroupXmlReader.cpp

...i-plugins/StatechartEditorPlugin/model/StateTreeModel.cpp

...gui-plugins/StatechartEditorPlugin/model/StateTreeModel.h

...ui-plugins/StatechartEditorPlugin/model/StateTreeNode.cpp

.../gui-plugins/StatechartEditorPlugin/model/StateTreeNode.h

...-plugins/StatechartEditorPlugin/model/StatechartGroup.cpp

...ui-plugins/StatechartEditorPlugin/model/StatechartGroup.h

...-plugins/StatechartEditorPlugin/renaming/GroupRenamer.cpp

...-plugins/StatechartEditorPlugin/renaming/StateRenamer.cpp

.../StatechartEditorPlugin/view/dialogs/CloneGroupDialog.cpp

...rtEditorPlugin/view/dialogs/EditStatechartGroupDialog.cpp