BMFMapVersion constructor Null safety

1. flutter_baidu_mapapi_map
2. flutter_baidu_mapapi_map
3. BMFMapVersion
4. BMFMapVersion constructor

BMFMapVersion class

1. Constructors
2. BMFMapVersion
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. nativeMapVersion