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/Controllers/AccountController.cs

@@ -89,7 +89,7 @@ namespace API.Controllers
 
             var user = _mapper.Map<AppUser>(registerDto);
             user.UserPreferences ??= new AppUserPreferences();
-
+            
             var result = await _userManager.CreateAsync(user, registerDto.Password);
 
             if (!result.Succeeded) return BadRequest(result.Errors);