ProgramOperation constructor Null safety

1. jrpn
2. model
3. ProgramOperation
4. ProgramOperation constructor

ProgramOperation class

1. Constructors
2. ProgramOperation
3. Properties
4. arg
5. argShift
6. debugLogId
7. hashCode
8. isShift
9. maxOneByteOpcodes
10. name
11. numericValue
12. programListingArgName
13. rcName
14. runtimeType
15. Methods
16. noSuchMethod
17. toString
18. Operators
19. operator ==