ModelType constructor Null safety

1. mapbox_maps
2. mapbox_maps
3. ModelType
4. ModelType const constructor

ModelType enum

1. Constructors
2. ModelType
3. Values
4. COMMON_3D
5. LOCATION_INDICATOR
6. Properties
7. hashCode
8. index
9. runtimeType
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Constants
16. values