add actors to movies and shows (#172)

* add actor metadata

* show actors in ui

* get full movie/show metadata from plex

* store actor thumbnail url

* rework movie detail page

* metadata fixes

* rework show detail page

* rework artist page

* code cleanup

ErsatzTV.Application/Movies/Mapper.cs

@@ -22,7 +22,9 @@ namespace ErsatzTV.Application.Movies
                 metadata.Genres.Map(g => g.Name).ToList(),
                 metadata.Tags.Map(t => t.Name).ToList(),
                 metadata.Studios.Map(s => s.Name).ToList(),
-                LanguagesForMovie(movie));
+                LanguagesForMovie(movie),
+                metadata.Actors.OrderBy(a => a.Order).ThenBy(a => a.Id).Map(MediaCards.Mapper.ProjectToViewModel)
+                    .ToList());
         }
 
         private static List<CultureInfo> LanguagesForMovie(Movie movie)