newVector method Null safety

1. Flutter
2. vector_math_lists
3. VectorList<T extends Vector>
4. newVector abstract method

VectorList class

1. Constructors
2. VectorList
3. fromList
4. view
5. Properties
6. buffer
7. hashCode
8. length
9. runtimeType
10. Methods
11. copy
12. load
13. newVector
14. noSuchMethod
15. store
16. toString
17. Operators
18. operator ==
19. operator []
20. operator []=