rework television media (#26)

* rework television media

* refactor poster saving

* television and movie views are working again

* remove dead code

* use paper styling for all cards

* add show poster, plot to seasons page

* remove missing shows; cleanup interfaces

* fix split show display (same show in different folders/sources)

* add placeholder "add to schedule" button

* no more duplicate television shows, even with the same show split across sources

* stop releasing CLI for now

* use season number as season placeholder

* add television shows to collections

* add television seasons to collections

* add television episodes to collections

* add movies to collections

* remove movies, shows, seasons, episodes from collections

* fix page width and menus

* fix buffer size defaults

* fix chronological episode ordering

* allow deleting media collections

* don't get stuck building a playout with an empty collection

* schedule editing and playouts work again

* minor cleanup

* remove dead code

* fix bugs with viewing movies as they are loading

* add scanner tests; support nested movie folders

* update collections docs

* rearrange order of schedule items

* add show and season to schedule

* delete schedules that use legacy collections, reset all posters

* move cleanup to new migration

* load fallback metadata when nfo fails; don't require metadata in ui

* update readme and screenshots

ErsatzTV.Core.Tests/Scheduling/ChronologicalContentTests.cs

@@ -62,12 +62,12 @@ namespace ErsatzTV.Core.Tests.Scheduling
 
         private static List<MediaItem> Episodes(int count) =>
             Range(1, count).Map(
-                    i => new MediaItem
+                    i => (MediaItem) new TelevisionEpisodeMediaItem
                     {
                         Id = i,
-                        Metadata = new MediaMetadata
+                        Metadata = new TelevisionEpisodeMetadata
                         {
-                            MediaType = MediaType.TvShow, Aired = new DateTime(2020, 1, i)
+                            Aired = new DateTime(2020, 1, i)
                         }
                     })
                 .Reverse()