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/Pages/Index.razor

@@ -1,7 +1,7 @@
 @page "/"
+@using Microsoft.Extensions.Caching.Memory
 @using System.Reflection
 @using ErsatzTV.Core.Interfaces.GitHub
-@using Microsoft.Extensions.Caching.Memory
 @inject IGitHubApiClient _gitHubApiClient
 @inject IMemoryCache _memoryCache
 
@@ -60,7 +60,7 @@
                 }
             }
         }
-        catch (Exception ex)
+        catch (Exception _)
         {
     // ignore
         }