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/Program.cs

@@ -75,7 +75,6 @@ namespace API
 
                 if (isDocker && new FileInfo("data/appsettings.json").Exists)
                 {
-                    //var logger = services.GetRequiredService<ILogger<Startup>>();
                     logger.LogCritical("WARNING! Mount point is incorrect, nothing here will persist. Please change your container mount from /kavita/data to /kavita/config");
                     return;
                 }