Add support for storing CICM XML inside DiscImageChef format.

dicformat.bt

@@ -759,6 +759,13 @@ typedef struct
     TrackEntry tracks[entries];
 } TracksHeader;
 
+typedef struct
+{
+    BlockType identifier;
+    uint length;
+    char xml[length];
+} CicmMetadataBlock;
+
 LittleEndian();
 
 local int i;
@@ -849,5 +856,8 @@ for(i = 0; i < index.entries; i++)
         case 0x534B5254:
             TracksHeader tracks;
             break;
+        case 0x4D434943:
+            CicmMetadataBlock cicmMetadata;
+            break;
     }
 }