storage property Null safety

1. Flutter
2. vector_math
3. Matrix2
4. storage property

Matrix2 class

1. Constructors
2. Matrix2
3. columns
4. copy
5. fromList
6. identity
7. outer
8. rotation
9. zero
10. Properties
11. dimension
12. hashCode
13. row0
14. row1
15. runtimeType
16. storage
17. Methods
18. absolute
19. absoluteError
20. add
21. clone
22. copyFromArray
23. copyInto
24. copyIntoArray
25. copyInverse
26. determinant
27. dotColumn
28. dotRow
29. entry
30. getColumn
31. getRow
32. index
33. infinityNorm
34. invert
35. multiplied
36. multiply
37. multiplyTranspose
38. negate
39. noSuchMethod
40. relativeError
41. scale
42. scaleAdjoint
43. scaled
44. setColumn
45. setColumns
46. setDiagonal
47. setEntry
48. setFrom
49. setIdentity
50. setOuter
51. setRotation
52. setRow
53. setValues
54. setZero
55. splatDiagonal
56. sub
57. toString
58. trace
59. transform
60. transformed
61. transpose
62. transposed
63. transposeMultiply
64. Operators
65. operator *
66. operator +
67. operator -
68. operator ==
69. operator []
70. operator []=
71. operator unary-
72. Static methods
73. solve