Added parentContainer property

Author: photonstorm

src/gameobjects/GameObject.js

@@ -55,6 +55,15 @@ var GameObject = new Class({
          */
         this.type = type;
 
+        /**
+         * The parent Container of this Game Object, if it has one.
+         *
+         * @name Phaser.GameObjects.GameObject#parentContainer
+         * @type {Phaser.GameObjects.Container}
+         * @since 3.4.0
+         */
+        this.parentContainer = null;
+
         /**
          * The name of this Game Object.
          * Empty by default and never populated by Phaser, this is left for developers to use.

src/gameobjects/container/Container.js

@@ -76,15 +76,6 @@ var Container = new Class({
          */
         this.position = 0;
 
-        /**
-         * The parent Container of this Container, if there is one.
-         *
-         * @name Phaser.GameObjects.Container#parentContainer
-         * @type {Phaser.GameObjects.Container}
-         * @since 3.4.0
-         */
-        this.parentContainer = null;
-
         /**
          * [description]
          *