icon property Null safety

1. baguette
2. AtlasMarker
3. AtlasMarker
4. icon property

AtlasMarker class

1. Constructors
2. AtlasMarker
3. Properties
4. data
5. hashCode
6. icon
7. id
8. location
9. onPress
10. runtimeType
11. window
12. Methods
13. noSuchMethod
14. toString
15. Operators
16. operator ==