xd as an alternative to hexdump

[ssokolow]

In addition to hexyl, there's also xd as a Rust alternative to hexdump (named based on the abbreviated hd alias to hexdump).

It hasn't achieved full compatibility yet, but it has the following advantage, without going "hawaiian shirt" colorful and fancy border-y like hexyl:

--table default — a tweaked code page 437, like on an old IBM PC. This encoding provides a unique glyph for each octet, making it reversible, and almost all of those glyphs are visually distinct, which is helpful when visualising patterns in binary data that transcends printable ASCII.