copywith_incomplete/update_copywith library

1. squiggly package
2. documentation
3. copywith_incomplete/update_copywith.dart

squiggly package

1. Libraries
2. copywith/add_copywith
3. copywith/copywith
4. copywith_incomplete/copywith_incomplete
5. copywith_incomplete/update_copywith
6. data_class/implement_data_class_methods
7. equality/add_equality
8. equality/equality
9. equality_incomplete/equality_incomplete
10. equality_incomplete/update_equality
11. logger
12. main
13. tostring/add_tostring
14. tostring/tostring
15. tostring_incomplete/tostring_incomplete
16. tostring_incomplete/update_tostring
17. utils