- Use the main display grid control to display deleted books
- Added search functionality for deleted books. This required creating a temporary search index in the `InProgress` folder. The products grid control now uses an instance of `ISearchEngine` to filter its grid entries. The main grid uses a singleton instance of `MainSearchEngine`, which merely wraps `SearchEngineCommands.Search()`. The TrashBinDialogs use `TempSearchEngine`.
- Users can now batch select `Everyting` as well as `Audible Plus Books`
Avalonia:
- Refactor main grid context menus to no longer require reflection
There are multiple subscribers to LibraryCommands.LibrarySizeChanged, and each one calls GetLibrary_Flat_NoTracking(). Passing the full library as an event argument speeds up all operations which happen after the library size changes.
Fix initial backup counts
