Gravity constructor Null safety

1. cloudinary_url_gen
2. gravity
3. Gravity
4. Gravity constructor

Gravity class

1. Constructors
2. Gravity
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. autoGravity
13. center
14. east
15. focusOn
16. north
17. northEast
18. northWest
19. south
20. southEast
21. southWest
22. west
23. xyCenter