OPDS-PS v1.2 Support + a few bugfixes (#1869)

* Fixed up a localization lookup test case

* Refactored some webp to a unified method

* Cleaned up some code

* Expanded webp conversion for covers to all entities

* Code cleanup

* Prompt the user when they are about to delete multiple series via bulk actions

* Aligned Kavita to OPDS-PS 1.2.

* Fixed a bug where clearing metadata filter of series name didn't clear the actual field.

* Added some documentation

* Refactored how covert covers to webp works. Now we will handle all custom covers for all entities. Volumes and Series will not be touched but instead be updated via a RefreshCovers call. This will fix up the references much faster.

* Fixed up the OPDS-PS 1.2 attributes to only show on PS links

API/Data/Repositories/ReadingListRepository.cs

@@ -36,6 +36,7 @@ public interface IReadingListRepository
     Task<bool> ReadingListExists(string name);
     Task<List<ReadingList>> GetAllReadingListsAsync();
     IEnumerable<PersonDto> GetReadingListCharactersAsync(int readingListId);
+    Task<IList<ReadingList>> GetAllWithNonWebPCovers();
 }
 
 public class ReadingListRepository : IReadingListRepository
@@ -106,6 +107,13 @@ public class ReadingListRepository : IReadingListRepository
             .AsEnumerable();
     }
 
+    public async Task<IList<ReadingList>> GetAllWithNonWebPCovers()
+    {
+        return await _context.ReadingList
+            .Where(c => !string.IsNullOrEmpty(c.CoverImage) && !c.CoverImage.EndsWith(".webp"))
+            .ToListAsync();
+    }
+
     public void Remove(ReadingListItem item)
     {
         _context.ReadingListItem.Remove(item);