[TEXTILE] Add Support for row and column span

[SnowMB]

When having a table with a row or column span, formatting adds empty cells and treats the span definition as content of the cell:

|_. A |_. B |_. C |_. D |_. E |
| content | content | content | content | content |
|\5. rowspan |
| content | content | content | content | content |

gets formatted to:

|_.      A      |_.    B    |_.    C    |_.    D    |_.    E    |
|   content     |   content |   content |   content |   content |
|   \5. rowspan |           |           |           |           |
|   content     |   content |   content |   content |   content |