Potential Simultaneous OAuth Problem #75
Description
I make it possible to be authorizing in two different windows at the same time, however I make the OAuthController a shared instance. I need to only allow the user to authorize in a single place at once, otherwise all the different tokens will go crazy on my ass.
The solution: when the user clicks authorize it launches the Preferences window and the authorization happens there, thus if it is already in progress when the user clicks authorize it will just show that window and will not start a new authorization process.