code: public Cell<?> applyPadding (final Cell<?> cell) {
  		cell.pad(top, left, bottom, right);
  		return cell;
  	}
docs: Allows to set Cell's padding with the Padding object, which has be done externally, as it's not part of
  the standard libGDX API.
  @param cell will have the padding set according to the this object's data.
  @return the given cell for chaining.