Better tile custom data support

core/src/mindustry/io/versions/Save8.java

@@ -2,6 +2,7 @@ package mindustry.io.versions;
 
 import mindustry.io.*;
 
+/** Adds support for the marker binary data region. The code is unchanged here, because it was easier to add a >= 8 check in the SaveVersion class itself. */
 public class Save8 extends SaveVersion{
 
     public Save8(){