hyperOp property Null safety

1. jrpn
2. jrpn15.main
3. CalculatorButtonHyperbolic
4. hyperOp property

CalculatorButtonHyperbolic class

1. Constructors
2. CalculatorButtonHyperbolic
3. Properties
4. acceleratorKey
5. acceleratorLabel
6. bFactory
7. fKey
8. fText
9. gKey
10. gText
11. gTextOffset
12. hashCode
13. height
14. hyperOp
15. innerBorder
16. innerBorderColor
17. inverseHyperOp
18. key
19. keyTextOffset
20. keyTextStyle
21. lowerSurface
22. lowerSurfaceColor
23. lowerSurfaceColorPressed
24. outerBorder
25. outerBorderPressedScale
26. runtimeType
27. uKey
28. upperSurface
29. upperSurfaceColor
30. upperSurfaceColorPressed
31. uText
32. width
33. Methods
34. createElement
35. createState
36. debugDescribeChildren
37. debugFillProperties
38. drawBlueText
39. drawGoldText
40. drawKeyboardAccelerator
41. drawText
42. drawWhiteText
43. noSuchMethod
44. paintForPainter
45. toDiagnosticsNode
46. toString
47. toStringDeep
48. toStringShallow
49. toStringShort
50. Operators
51. operator ==