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/Helpers/TagHelper.cs

@@ -24,9 +24,6 @@ public static class TagHelper
             var added = false;
             var normalizedName = Parser.Parser.Normalize(name);
 
-            // var tag = DbFactory.Tag(name, isExternal);
-            // TagHelper.AddTagIfNotExists(allTags, tag);
-
             var genre = allTags.FirstOrDefault(p =>
                 p.NormalizedTitle.Equals(normalizedName) && p.ExternalTag == isExternal);
             if (genre == null)