code: public List<Balance> getAllWorldBalance(String world) {
          if (!Common.getInstance().getWorldGroupManager().worldGroupExist(world)) {
              world = Common.getInstance().getWorldGroupManager().getWorldGroupName(world);
          }
          return Common.getInstance().getStorageHandler().getStorageEngine().getAllWorldBalance(this, world);
      }
docs: Get the whole account balance in a certain world / world group
  
  @param world The world / world group to search in
  @return A list of Balance