Handle directory entries that contain a forward slash in the filename in FAT filesystem.

Aaru.Filesystems/FAT/Dir.cs

@@ -292,6 +292,9 @@ namespace Aaru.Filesystems
                         completeEntry.HumanName = filename;
                     }
 
+                    // Atari ST allows slash AND colon so cannot simply substitute one for the other like in Mac filesystems
+                    filename = filename.Replace('/', '\u2215');
+
                     // Using array accessor ensures that repeated entries just get substituted.
                     // Repeated entries are not allowed but some bad implementations (e.g. FAT32.IFS)allow to create them
                     // when using spaces

Aaru.Filesystems/FAT/Super.cs

@@ -666,6 +666,9 @@ namespace Aaru.Filesystems
                         continue;
                 }
 
+                // Atari ST allows slash AND colon so cannot simply substitute one for the other like in Mac filesystems
+                filename = filename.Replace('/', '\u2215');
+
                 completeEntry.Shortname = filename;
 
                 if(_namespace == Namespace.Human)