Misc Fixes and Changes (#927)

* Cleaned up a ton of warnings/suggestions from the IDE.

* Fixed a bug when clearing the filters some presets could be undone.

* Renamed a class in the OPDS spec

* Simplified logic for when Fit To Screen rendering logic occurs. It now works always rather than only on cover images.

* Give some additional info to the user on what the differences between Library Types are

* Don't scan .qpkg folders (QNAP devices)

* Refactored some code to enable ability to test CoverImage Test. This is a broken test, test.zip is waiting on an issue in NetVips.

* Fixed an issue where Extra might get flagged as special too early, if in a word like Extraordinary

* Cleaned up the regex for the extra issue to be more flexible

API/Startup.cs

@@ -144,7 +144,7 @@ namespace API
                 {
                     // Apply all migrations on startup
                     // If we have pending migrations, make a backup first
-                    var isDocker = new OsInfo(Array.Empty<IOsVersionAdapter>()).IsDocker;
+                    //var isDocker = new OsInfo(Array.Empty<IOsVersionAdapter>()).IsDocker;
                     var logger = serviceProvider.GetRequiredService<ILogger<Program>>();
                     var context = serviceProvider.GetRequiredService<DataContext>();
                     // var pendingMigrations = await context.Database.GetPendingMigrationsAsync();