Add a new detection way

Close #38

Some webshells are using non-printable characters, so we match on them
(kudos to @blotus for the idea).

The regexp `[^ -~]` is completely killing the performances, this is why
we're using [atoms](https://gist.github.com/Neo23x0/e3d4e316d7441d9143c7)
to dramatically increase the scanning speed.

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