EngineNotificationParameterUnit constructor Null safety

1. irte_engine
2. engine_notification_parameter_unit
3. EngineNotificationParameterUnit
4. EngineNotificationParameterUnit constructor

EngineNotificationParameterUnit class

1. Constructors
2. EngineNotificationParameterUnit
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. imperial
13. metric
14. timestamp