Private callbacksPrivate localPrivate objectsPrivate parentStatic fromCreate a new container for objects lists, inheriting from another one. This is
useful should we get the objects that have not been saved in this context (using
addObject) but saved in a parent context.
This avoids to save all object lists every time we create a new LongLivedObjectsList,
despite not all objects lists being used.
Private get
A container for objects lists that should last more than the current frame. It automatically removes objects that were destroyed from the objects lists.