class and table schema now conform to JSON

src/engine/objects/Building.java

@@ -460,7 +460,7 @@ public class Building extends AbstractWorldObject {
                 }
             }
         }
-        if (this.parentZone.isGuildZone == false)
+        if (this.parentZone.guild_zone == false)
             return null;
 
         return City.getCity(this.parentZone.playerCityUUID);