function sRowChar = li_charcatall(sCharArr, sDelim)
Concatenates an n-dimensional character array <sCharArr> using <sDelim> as delimiter (optionally empty). Concatenation takes place row-first (over column indices) without applying the delimiter. Second is row-index followed by all higher dimensions in ascending order, all with the delimiter applied at the end. <sChar> might be of type char, uint8 or int8, while <sDelim> must allways be of type char. Returned <sRowChar> is always a 1xn row vector char.