Update SpongeSchematic format to version 2.

Allows saving and loading entities and biomes.

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitServerInterface.java

@@ -65,6 +65,12 @@ public class BukkitServerInterface implements MultiUserPlatform {
         return BukkitRegistries.getInstance();
     }
 
+    @Override
+    public int getDataVersion() {
+        // TODO - add to adapter - CraftMagicNumbers#getDataVersion
+        return 1631;
+    }
+
     @Override
     public boolean isValidMobType(String type) {
         final EntityType entityType = EntityType.fromName(type);