Make issues more informative

[primetime43]

Plex set up incomplete isn't descriptive enough to know what the issue is. You may want to rely on the PlexAPI to just have the user sign in and get the necessary info rather than all this manual stuff with the token and server etc.

[tonywied17]

I was able to work in Plex.tv sign-in/oauth as well as more detailed log/event viewer.

Just waiting for bbrown to review PR, but you can clone my fork as well:
https://github.com/tonywied17/plex-poster-set-helper

I believe another user mentioned this and also worked in oauth if you prefer that over the tv code linking or wanted multiple options to try out to see if something works for you.