Use here-doc for stdin if both stdin and arguments are used #485
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Currently, we just add the stdin below the command that is executed, which is not clear at all. We now use here-doc to display stdin in that case.
If only stdin is used, nothing changes: only stdin is shown.
It looks like this:
The colouring is sometimes a bit wonky, both Rouge and Pygments are not that good at highlighting here-docs.
Fixes #484.