#4538 Skip Save project at exit when no data has changed

Guard changes in preferences and reset change detector when project is closed

ApplicationCode/Application/RiaApplication.h

@@ -121,6 +121,7 @@ public:
 
     bool openFile(const QString& fileName);
 
+    bool        isProjectSavedToDisc() const;
     QString     currentProjectPath() const;
     QString     createAbsolutePathFromProjectRelativePath(QString projectRelativePath);
     bool        loadProject(const QString& projectFileName);