Capture STDOUT as bytes, and convert to string when necessary

Previously, the recite() function created the 'out' variable, which was
a String, that got passed to the various incant functions, in order to
capture STDOUT in certain situations. In cases where STDOUT was
captured, it was first converted to a String, and then appended to the
'out' variable, by means of String::from_utf8_lossy(). This works for
basic text, however, does NOT work for binary data. This becomes
problematic, when for example, downling a tar file with curl/wget, that
is then piped ('|') to the tar program. Using from_utf8_lossy() in this
case can corrupt the tar file. This patch makes it so that out is stored
as bytes by default, and only converted to a String when necessary.

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