ConstValues constructor Null safety

1. mc_gallery
2. const_values
3. ConstValues
4. ConstValues constructor

ConstValues class

1. Constructors
2. ConstValues
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. defaultEmulatedLatencyMillis
13. httpsScheme
14. imagesHostServer
15. imagesHostUrlPathSegments
16. maxImageSize
17. minImageSize
18. numberOfImages