enable plex for movies (#72)

* re-enable plex, temp force secure connections

* add plex fanart

* synchronize genre from plex

* fix plex library sync

* improve stream error handling

* synchronize plex artwork

* use switch instead of button

* prioritize local connections for insecure plex sources

* sign out of plex

* better plex sign in/out

* code cleanup

* fix plex movie aspect ratio and scan type

ErsatzTV.Core/FFmpeg/FFmpegProcessService.cs

@@ -84,7 +84,7 @@ namespace ErsatzTV.Core.FFmpeg
                 .Build();
         }
 
-        public Process ForOfflineImage(string ffmpegPath, Channel channel, Option<TimeSpan> duration)
+        public Process ForError(string ffmpegPath, Channel channel, Option<TimeSpan> duration, string errorMessage)
         {
             FFmpegPlaybackSettings playbackSettings =
                 _playbackSettingsCalculator.CalculateErrorSettings(channel.FFmpegProfile);
@@ -99,7 +99,7 @@ namespace ErsatzTV.Core.FFmpeg
                 .WithLoopedImage("Resources/background.png")
                 .WithLibavfilter()
                 .WithInput("anullsrc")
-                .WithErrorText(desiredResolution, "Channel is Offline")
+                .WithErrorText(desiredResolution, errorMessage)
                 .WithPixfmt("yuv420p")
                 .WithPlaybackArgs(playbackSettings)
                 .WithMetadata(channel)