New: Support existing 'keyart' in Kodi Metadata

Fixes #5059

src/NzbDrone.Core/Extras/Metadata/Consumers/Xbmc/XbmcMetadata.cs

@@ -39,8 +39,8 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Xbmc
             _creditService = creditService;
         }
 
-        private static readonly Regex MovieImagesRegex = new Regex(@"^(?<type>poster|banner|fanart|clearart|discart|landscape|logo|backdrop|clearlogo)\.(?:png|jpe?g)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
-        private static readonly Regex MovieFileImageRegex = new Regex(@"(?<type>-thumb|-poster|-banner|-fanart|-clearart|-discart|-landscape|-logo|-backdrop|-clearlogo)\.(?:png|jpe?g)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex MovieImagesRegex = new Regex(@"^(?<type>poster|banner|fanart|clearart|discart|keyart|landscape|logo|backdrop|clearlogo)\.(?:png|jpe?g)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex MovieFileImageRegex = new Regex(@"(?<type>-thumb|-poster|-banner|-fanart|-clearart|-discart|-keyart|-landscape|-logo|-backdrop|-clearlogo)\.(?:png|jpe?g)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public override string Name => "Kodi (XBMC) / Emby";