Certain nested lists cause terrible html to be generated

Most notably:

```
<li numId=1, ilvl=0 />
  <tbl>
    <tr>
      <tc>
        <li numId=1, ilvl=0 />
      </tc>
    </tr>
  </tbl>
```

This will generate html that puts li tags inside td tags (instead of an ol/ul)

Namespace the num_id on the element based on how deep in a table the list is. This way they would be considered two separate lists.