Partial 7.0 merge - API preview

core/src/mindustry/io/versions/Save4.java

@@ -2,9 +2,25 @@ package mindustry.io.versions;
 
 import mindustry.io.*;
 
+import java.io.*;
+
+/** This version only writes entities, no entity ID mappings. */
 public class Save4 extends SaveVersion{
 
     public Save4(){
         super(4);
     }
+
+    @Override
+    public void writeEntities(DataOutput stream) throws IOException{
+        writeTeamBlocks(stream);
+        writeWorldEntities(stream);
+    }
+
+    @Override
+    public void readEntities(DataInput stream) throws IOException{
+        readTeamBlocks(stream);
+        readWorldEntities(stream);
+    }
+
 }