isPermissions abstract method Null safety

1. baguette
2. IPermissionManager
3. IPermissionManager
4. isPermissions abstract method

IPermissionManager class

1. Constructors
2. IPermissionManager
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. addPlugin
8. askPermissions
9. cleanPlugins
10. getPlugin
11. isPermissions
12. noSuchMethod
13. removePlugin
14. toString
15. Operators
16. operator ==