cache_manager library Null safety

1. appmayor
2. cache_manager library

appmayor package

1. Libraries
2. addApp
3. addedApps
4. addIcons
5. app
6. appButton
7. appList
8. aprende
9. auth
10. battery
11. battery_indicator
12. button
13. buttons
14. cache_manager
15. card3d
16. colors
17. constants
18. contactbuttonOne
19. contactbuttonTwo
20. contactCard
21. contactList
22. customCard
23. customView
24. data
25. db_provider
26. emergency
27. facebookbutton
28. firebase_options
29. globals
30. main
31. notificationbadge
32. panel1
33. panel2
34. panel3
35. panel4
36. portalmayor
37. pushnotification
38. registerUser
39. remote_config_service
40. rutValidator
41. saludResponde
42. size_helpers
43. smslist
44. splash
45. title
46. user
47. userProvider
48. watch
49. webview
50. whatsappbutton
51. wrapper