Make an easier, more standardized way to use the test account

[ifisq]

Right now, it's a bit difficult to use the test account since every time we want to login on a new simulator/device, we have to get the 6-digit GitHub code. I was thinking that we could possibly build in a way to automatically login to the test account by changing a parameter somewhere in the code that lets the app know that it's being run on simulator or via xcode. One way of doing this could be on startup where we check if the app is in a "test mode" (set by us), and if it is, it uses test credentials that are already saved to authenticate.