code: public CellConstraints xyw(int col, int row, int colSpan) {
          return xywh(col, row, colSpan, 1, DEFAULT, DEFAULT);
      }
docs: Sets the column, row, width, and height; uses a height (row span) of 1 and the horizontal and
  vertical default alignments.<p>
  
  <strong>Examples:</strong><pre>
  cc.xyw(1, 3, 7);
  cc.xyw(1, 3, 2);
  </pre>
  
  @param col the new column index
  @param row the new row index
  @param colSpan the column span or grid width
  @return this