Added Read only access to the link game view camera

CHANGELOG.md

 - Discover : Tag Filtering System
 - Discover : Images in Discover Window
 - Find and Replace : Result list enables selecting / focusing on objects
+- Added API Access to the Link Game View Camera object
 
 ## 2019.3.4
 

Editor/GameViewLink/LinkGameView.cs

             Menu.SetChecked(kMenuPath, Active);
             return SceneView.sceneViews.Count > 0;
         }
-        
+
+        public static GameObject Camera { get {return s_GameObject;} }
         static GameObject s_GameObject;
 
         static void Update(SceneView sceneView)