Use quicktype module to generate language-dependent structure instead of json

In my project I noticed an issue - some clients try to replace data in JSON by concatenating strings and complain about "API broken". It would be nice to have 
```python
body = { "a": True, "b": None}
```
instead of 
```python
body = '{"a": true, "b": none}'
```

I'll try by myself, but can not promise I'll complete this task