Problem with `<hr>` in LaTeX multicolumn cell

In case we have a `<hr>` in a table cell then it is displayed as a horizontal line (in LaTeX) unless it is in a multicolumn cell. In the later case it throws an error:
```
! You can't use `\hrule' here except with leaders.
\DoxyHorRuler ... }{0ex plus 0ex minus 0ex}\hrule
```

We have to use use `\hrulefill` in a table but in combination with the table option of xcolor this gives some problems so a new command has to be defined for this.

See also:
- horizontal rule / line inside a multicolumn field (https://tex.stackexchange.com/questions/506211/horizontal-rule-line-inside-a-multicolumn-field)
- interaction between \usepackage[table]{xcolor} and \hrulefill (https://tex.stackexchange.com/questions/506221/interaction-between-usepackagetablexcolor-and-hrulefill)

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