17: MapBlocks contain timestamp
18: new generator (not really necessary, but it's there)
19: new content type handling
+ 20: many existing content types translated to extended ones
*/
// This represents an uninitialized or invalid format
#define SER_FMT_VER_INVALID 255
// Highest supported serialization version
-#define SER_FMT_VER_HIGHEST 19
+#define SER_FMT_VER_HIGHEST 20
// Lowest supported serialization version
#define SER_FMT_VER_LOWEST 0