Add missing "serializeLocal" booleans to couple Entity serialization functions. Add ShouldBeSerialize() helper functios for Entity and Component.
Fix bug that caused temporary component to be serialized to TXML even if it was not wanted.
Unify the order of serializeTemporary, serializeLocal, and serializeChildren booleans in scene serialization functions. Switch default value of bool createSceneElement from true to false in Entity::SerializeToXMLString() (should be safe change as this a new addition and used only in single place currently according to @cadaver).