Locator constructor Null safety

1. mc_gallery
2. locator
3. Locator
4. Locator constructor

Locator class

1. Constructors
2. Locator
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. instance
13. locate
14. setup