#3384 Add RiaApplication::enableDebugFeatures method that checks environment for RESINSIGHT_DEBUG

* Disable System tab of preferences if this is not enabled.

ApplicationCode/Application/RiaApplication.h

@@ -106,7 +106,7 @@ public:
 
     RimViewWindow*      activePlotWindow() const;
 
-    RimProject*            project(); 
+    RimProject*         project(); 
 
     void                createMockModel();
     void                createResultsMockModel();
@@ -203,6 +203,8 @@ public:
     void                waitUntilCommandObjectsHasBeenProcessed();
     void                saveWinGeoAndDockToolBarLayout();
 
+    static bool         enableDevelopmentFeatures();
+
 private:
     void                    onProjectOpenedOrClosed();
     void                    setWindowCaptionFromAppState();