[Toybox] [PATCH] Add xxd -p and -r.

[enh]

SELinux denials include hex-encoded paths in the log messages; xxd -r -p is
a convenient way to decode them.

The heuristics are a little weird to my mind, but match the documentation
and observed behavior.
---
 tests/xxd.test   | 19 ++++++++++++++
 toys/other/xxd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 92 insertions(+), 7 deletions(-)
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