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.Core/Metadata/Nfo/ActorNfo.cs

@@ -0,0 +1,19 @@
+using System.Xml.Serialization;
+
+namespace ErsatzTV.Core.Metadata.Nfo
+{
+    public class ActorNfo
+    {
+        [XmlElement("name")]
+        public string Name { get; set; }
+
+        [XmlElement("role")]
+        public string Role { get; set; }
+
+        [XmlElement("order")]
+        public int? Order { get; set; }
+
+        [XmlElement("thumb")]
+        public string Thumb { get; set; }
+    }
+}

ErsatzTV.Core/Metadata/Nfo/MovieNfo.cs

@@ -36,5 +36,8 @@ namespace ErsatzTV.Core.Metadata.Nfo
 
         [XmlElement("studio")]
         public List<string> Studios { get; set; }
+
+        [XmlElement("actor")]
+        public List<ActorNfo> Actors { get; set; }
     }
 }

ErsatzTV.Core/Metadata/Nfo/TvShowEpisodeNfo.cs

@@ -1,4 +1,5 @@
-using System.Xml.Serialization;
+using System.Collections.Generic;
+using System.Xml.Serialization;
 
 namespace ErsatzTV.Core.Metadata.Nfo
 {
@@ -25,5 +26,8 @@ namespace ErsatzTV.Core.Metadata.Nfo
 
         [XmlElement("plot")]
         public string Plot { get; set; }
+
+        [XmlElement("actor")]
+        public List<ActorNfo> Actors { get; set; }
     }
 }

ErsatzTV.Core/Metadata/Nfo/TvShowNfo.cs

@@ -32,5 +32,8 @@ namespace ErsatzTV.Core.Metadata.Nfo
 
         [XmlElement("studio")]
         public List<string> Studios { get; set; }
+
+        [XmlElement("actor")]
+        public List<ActorNfo> Actors { get; set; }
     }
 }