Identifiable<ID_TYPE> constructor Null safety

1. irte_engine
2. identifiable.interface
3. Identifiable<ID_TYPE>
4. Identifiable constructor

Identifiable class

1. Constructors
2. Identifiable
3. Properties
4. hashCode
5. id
6. runtimeType
7. Methods
8. noSuchMethod
9. toString
10. Operators
11. operator ==