correction of adding custom menu

correction of setProperty
updating CHANGELOG
updating api-reference

front/src/Phaser/Menu/MenuScene.ts

@@ -49,7 +49,10 @@ export class MenuScene extends Phaser.Scene {
 
         this.subscriptions.add(iframeListener.registerMenuCommandStream.subscribe(menuCommand => {
             this.addMenuOption(menuCommand);
+        }))
 
+        this.subscriptions.add(iframeListener.unregisterMenuCommandStream.subscribe(menuCommand => {
+            this.destroyMenu(menuCommand);
         }))
     }
 
@@ -386,6 +389,10 @@ export class MenuScene extends Phaser.Scene {
         }
     }
 
+    public destroyMenu(menu: string) {
+        this.menuElement.getChildByID(menu).remove();
+    }
+
     public isDirty(): boolean {
         return false;
     }