docs: public boolean removeMessageFilter(Integer intFilterID, boolean bFreeFilter)
      {
          BaseMessageFilter filter = (BaseMessageFilter)m_mapFilters.remove(intFilterID);
          if (filter == null)
          {
              System.out.println("Error: BaseMessageReceiver.removeMessageFilter");
              return false;
          }
          filter.setMessageReceiver(null, null);        // Make sure free doesn't try to remove filter again.
          if (bFreeFilter)
              filter.free();
          return true;    // Success.
      }