Add same column cells merge

[Osamitch]

Add syntax to merge cells from one column.
To merge two cells, add ^^^ in a lower cell. Example:

| A mmo <br> Патроны        | green   |
| ^^^                       | yellow  |
| ^^^                       |  red    |
| ^^^                       | black   |
| C asualties <br>Ранения   | green   |
| ^^^                       | yellow  |
| ^^^                       |  red    |
| ^^^                       | black   |