Expose public methods in VideoController (#64)

- Allow for registering with conference after the fact
- Allow for creating renderer after the fact

Runtime/Components/video/VideoController.cs

@@ -36,15 +36,15 @@ public class VideoController : MonoBehaviour
 
         private VideoTrack _videoTrack;
 
-        void Awake()
+        public void RegisterController()
         {
             if (Conference)
             {
                 Conference.RegisterVideoController(this);
             }
         }
 
-        void Start()
+        public void CreateRenderer()
         {
             var renderer = gameObject.GetComponent<Renderer>();
 
@@ -54,6 +54,16 @@ void Start()
             }
         }
 
+        void Awake()
+        {
+            RegisterController();
+        }
+
+        void Start()
+        {
+            CreateRenderer();
+        }
+
         private void Update()
         {
 
@@ -76,4 +86,4 @@ internal void UpdateTrack(VideoTrack track)
             }
         }
     }
-}
+}