Feature/parse scanned files tests (#934)

* Fixed a bug in CleanupBookmarks where the Except was deleting all files because the path separators didn't match.

* Added unit tests for ParseScannedFiles.cs.

* Fixed some unit tests. Parser will now clear out multiple spaces in a row and replace with a single.

API/Parser/Parser.cs

@@ -502,6 +502,11 @@ namespace API.Parser
                 MatchOptions, RegexTimeout
         );
 
+        private static readonly Regex EmptySpaceRegex = new Regex(
+                @"(?!=.+)(\s{2,})(?!=.+)",
+                MatchOptions, RegexTimeout
+        );
+
         public static MangaFormat ParseFormat(string filePath)
         {
             if (IsArchive(filePath)) return MangaFormat.Archive;
@@ -841,6 +846,8 @@ namespace API.Parser
                 title = title.Substring(1);
             }
 
+            title = EmptySpaceRegex.Replace(title, " ");
+
             return title.Trim();
         }