Readonly
destroy$
Optional
gameParent GameObject is assigned at creation. BaseScene/Scene has no gameObject
Each Lifecycle Object has label for pixi debugging.
Readonly
update$
When Lifecycle Object is updated, it emits this subject. Along with updating his children, which in turn behave the same.
When Lifecycle Object is destroyed, it emits and closes this subject. Along with destroying his children, which in turn behave the same.