IContextBase constructor Null safety

1. nyxx_commands
2. nyxx_commands
3. IContextBase
4. IContextBase constructor

IContextBase class

1. Constructors
2. IContextBase
3. Properties
4. channel
5. client
6. command
7. commands
8. guild
9. hashCode
10. member
11. runtimeType
12. user
13. Methods
14. noSuchMethod
15. toString
16. Operators
17. operator ==