Book Feedback and small bugs (#183)

* Remove automatic retry for scanLibraries as if something fails, it wont pass magically. Catch exceptions when opening books for parsing and swallow to ignore the file.

* Delete extra attempts

* Switched to using FirstOrDefault for finding existing series. This will help avoid pointless crashes.

* Updated message when duplicate series are found (not sure how this happens)

* Fixed a negation for deleting volumes where files still exist.

* Implemented the ability to automatically scale the manga reader based on screen size.

API/Entities/Enums/ScalingOption.cs

@@ -4,6 +4,7 @@
     {
         FitToHeight = 0,
         FitToWidth = 1,
-        Original = 2
+        Original = 2,
+        Automatic = 3
     }
 }