New refresh logic

I have changed the refresh logic from timed refreshes. Now before every call, a i check the expiration time of the access token, and if has expired, before the original call i ask a new refresh token. Refresh token call is secured with a trial network call, if it fails with timeout, or takes a lot of time i wont refresh it and return with a network error. Bad connection notification is added to the syncing screen, and if somehow our refresh token invalidates, a button will navigate the user to the serverList page where he can easily log in. In that way i check the token before the call, but if somehow the server responds with invalid access token, i invalidate the token and retry the call, thus a new token will be asked.

HasTokenListener redux state has to be deleted if this is the right way to continue.

Server reducer got an initial hidden state.