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/Errors/PlayoutItemDoesNotExistOnDisk.cs

@@ -0,0 +1,9 @@
+namespace ErsatzTV.Core.Errors
+{
+    public class PlayoutItemDoesNotExistOnDisk : BaseError
+    {
+        public PlayoutItemDoesNotExistOnDisk(string path) : base($"Playout item does not exist on disk\n{path}")
+        {
+        }
+    }
+}

ErsatzTV.Core/Errors/UnableToLocatePlayoutItem.cs

@@ -0,0 +1,9 @@
+namespace ErsatzTV.Core.Errors
+{
+    public class UnableToLocatePlayoutItem : BaseError
+    {
+        public UnableToLocatePlayoutItem() : base("Unable to locate playout item")
+        {
+        }
+    }
+}