(svn r16338) -Codechange: split loading of references to two phases

In the first phase, indexes are stored. In the second phase, indexes are checked for validity and converted to pointers

src/saveload/saveload.h

@@ -52,6 +52,7 @@ struct ChunkHandler {
 	uint32 id;
 	ChunkSaveLoadProc *save_proc;
 	ChunkSaveLoadProc *load_proc;
+	ChunkSaveLoadProc *ptrs_proc;
 	uint32 flags;
 };