feat: removed IEnumerable from IUniverseObject for intellisense clarity

Use IUniverseObject.Children to access children

Engine.Core/UniverseObject.cs

@@ -165,7 +165,4 @@ public class UniverseObject : BaseEntity, IUniverseObject
     {
         _name = GetType().Name;
     }
-
-    public IEnumerator<IUniverseObject> GetEnumerator() => _children.GetEnumerator();
-    IEnumerator IEnumerable.GetEnumerator() => _children.GetEnumerator();
 }