implemented functions from NativeFunctions.cs

src-csharp/GameObject.cs

@@ -39,7 +39,7 @@ public class GameObject
 
     static public GameObject Create()
     {
-        NativeMethods.createGameObject(out ulong id, out uint index);
+        NativeFunctions.createGameObject(out ulong id, out uint index);
         var o = new GameObject(id, index);
         return o;
     }
@@ -49,7 +49,7 @@ public class GameObject
         if(_isDestroyed)
             return;
 
-        _isDestroyed = NativeMethods.destroyGameObject(_index);
+        _isDestroyed = NativeFunctions.freeGameObject(_index);
         if(!_isDestroyed)
             throw new Exception($"Can't destroy GameObject({_id})");
     }