[Toybox] [PATCH] xxd

[enh]

i've long been a hexdump(1) user, but someone on my team habitually uses
xxd(1) and seeing that it was bi-directional was enough to switch my
alleigance. this patch doesn't add that part, but it does cover the basic
use cases.

(right now Android just has a shell function 'hd'.)

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.
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