ICommandEntity constructor Null safety

1. nyxx_commander
2. nyxx_commander
3. ICommandEntity
4. ICommandEntity constructor

ICommandEntity class

1. Constructors
2. ICommandEntity
3. Properties
4. afterHandler
5. aliases
6. beforeHandler
7. commandNames
8. hashCode
9. name
10. parent
11. runtimeType
12. Methods
13. getFullCommandMatch
14. isEntityName
15. noSuchMethod
16. toString
17. Operators
18. operator ==