Replace plain fetch with something else

[Fábio Rosado]

For now using fetch is working okay, but after testing the websocket token, I've noticed that once we get a forbidden request from the server all we get as an error message was: Failed to fetch which is as useful as you would expect.

We probably should replace fetch with something more useful. The motivation behind that is that we have a way to keep errors in our state store and in the future we should present that to the user. So it would be good to get a lot more information why a request failed.

Useful things:

• status code
• message
• any extra data that we can add to the state