add trash system for local libraries (#571)

* flag local movies as file not found

* show warning icon on cards

* unflag movie that is found during scan

* skip missing files when building playouts

* add state to search index

* add file not found health check

* link to search from file not found health check

* support flagging other media kinds as file not found

* continue to schedule missing items

* support episode files not found

* wip trash page

* fix trash url

* trash page is functional

* update changelog

* fix changelog merge

ErsatzTV.Core.Tests/Fakes/FakeLocalFileSystem.cs

@@ -44,7 +44,7 @@ namespace ErsatzTV.Core.Tests.Fakes
                 .IfNone(SystemTime.MinValueUtc);
 
         public bool IsLibraryPathAccessible(LibraryPath libraryPath) =>
-            _files.Any(f => f.Path.StartsWith(libraryPath.Path + Path.DirectorySeparatorChar));
+            _folders.Any(f => f.Path == libraryPath.Path);
 
         public IEnumerable<string> ListSubdirectories(string folder) =>
             _folders.Map(f => f.Path).Filter(f => f.StartsWith(folder) && Directory.GetParent(f)?.FullName == folder);
@@ -53,6 +53,7 @@ namespace ErsatzTV.Core.Tests.Fakes
             _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
 
         public bool FileExists(string path) => _files.Any(f => f.Path == path);
+        public bool FolderExists(string folder) => false;
 
         public Task<byte[]> ReadAllBytes(string path) => TestBytes.AsTask();