Fix reparenting actors in editor to preserve world position

#500

Source/Engine/Level/Actor.cs

@@ -124,7 +124,7 @@ namespace FlaxEngine
         public Actor AddChild(Type type)
         {
             var result = (Actor)New(type);
-            result.SetParent(this, false);
+            result.SetParent(this, false, false);
             return result;
         }
 
@@ -136,7 +136,7 @@ namespace FlaxEngine
         public T AddChild<T>() where T : Actor
         {
             var result = New<T>();
-            result.SetParent(this, false);
+            result.SetParent(this, false, false);
             return result;
         }
 
@@ -173,7 +173,7 @@ namespace FlaxEngine
             if (result == null)
             {
                 result = New<T>();
-                result.SetParent(this, false);
+                result.SetParent(this, false, false);
             }
             return result;
         }

Source/Engine/Level/Actor.h

@@ -176,7 +176,7 @@ public:
     /// <param name="value">New parent</param>
     /// <param name="worldPositionsStays">Should actor world positions remain the same after parent change?</param>
     /// <param name="canBreakPrefabLink">True if can break prefab link on changing the parent.</param>
-    void SetParent(Actor* value, bool worldPositionsStays, bool canBreakPrefabLink);
+    API_FUNCTION() void SetParent(Actor* value, bool worldPositionsStays, bool canBreakPrefabLink);
 
     /// <summary>
     /// Gets amount of child actors.