code: public static <T> Callback<T> convertCallback(final io.advantageous.reakt.CallbackHandler<T> callback) {
          return convertReaktCallbackToQBitCallback(callback, CallbackBuilder.callbackBuilder());
      }
docs: Converts a Reakt callback into a QBit callback.
  
  @param callback reakt callback
  @param <T>      type of result
  @return QBit callback