code: public static Cell<?> setSpacing (final Padding spacing, final Cell<?> cell) {
  		return cell.space(spacing.getTop(), spacing.getLeft(), spacing.getBottom(), spacing.getRight());
  	}
docs: Allows to set Cell's spacing with the Padding object, which has be done externally, as it's not part of
  the standard libGDX API. Padding holds 4 floats for each direction, so it's compatible with both
  padding and spacing settings without any additional changes.
  @param spacing contains data of spacing sizes.
  @param cell will have the padding set according to the given data.
  @return the given cell for chaining.