Adding generic sub-commands

Hi there,

I really like the ability to use \dot to inline state transition diagrams -
it's a great usage of Graphviz!

In addition to this I would be keen to add a generic command runner to allow
other apps that can generate images or text to be used.  E.g.

/**
 * blah blah
 * \icmd html gnuplot $in
 * set terminal png color
 * set out $out
 * plot sin(x) 
 * quit
 * \endicmd
 */

Some expansion of things like $in, $out and maybe something like $type could
be used by ensure that the input and output can be supplied and accessed by
Doxygen, as well as allowing the command or script to generate the desired
output type (e.g. png or eps).

What do people think, would this be cool?  

Regards,

Mike



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