SolveProgramRunner constructor Null safety

1. jrpn
2. jrpn15.runners
3. SolveProgramRunner
4. SolveProgramRunner constructor

SolveProgramRunner class

1. Constructors
2. SolveProgramRunner
3. Properties
4. caller
5. hashCode
6. model
7. parent
8. registersRequired
9. returnStackStartPos
10. runImplicitRtnOnSST
11. runtimeType
12. Methods
13. abort
14. checkStartRunning
15. fail
16. noSuchMethod
17. pushPseudoReturn
18. restart
19. resume
20. run
21. runCalculation
22. runSubroutine
23. runSubroutineErrorsOK
24. startRunningProgram
25. suspend
26. toString
27. Operators
28. operator ==