Save settings less aggressively.

Remove saving settings on auto-save, and only save settings when
switching away from projects mode, instead of any mode switch.

Change-Id: I3369b7f5ee785467d57c47e1a194a8ef989b98fb
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/coreplugin/modemanager.h

@@ -82,8 +82,6 @@ private slots:
     void currentTabChanged(int index);
     void updateModeToolTip();
     void enabledStateChanged();
-    void handleStartup();
-    void handleShutdown();
 
 private:
     explicit ModeManager(Internal::MainWindow *mainWindow, Internal::FancyTabWidget *modeStack);