Added missing structures and corrected both-endian fields for ISO9660.

DiscImageChef.Filesystems/ISO9660/ISO9660.cs

@@ -38,6 +38,9 @@ namespace DiscImageChef.Filesystems.ISO9660
     // This is coded following ECMA-119.
     // TODO: Differentiate ISO Level 1, 2, 3 and ISO 9660:1999
     // TODO: Apple extensiones, requires XA or advance RR interpretation.
+    // TODO: Check ECMA-167
+    // TODO: Check ECMA-168
+    // TODO: HighSierra
     public partial class ISO9660 : Filesystem
     {
         public ISO9660()