Add -0 shortcut for --null

[caedn]

I've use ag with -0 a lot to safely pipe it into xargs. Any chance you could add the same alias so I don't have to type as much when switching to rg?

[BurntSushi]

I'd be willing to add a -Z short flag for --null, since that's what grep does. (ripgrep obviously takes a certain amount of inspiration from ag, but when there's a choice to be made with respect to flags, I've tended to side with GNU grep because of its ubiquity.)

[caedn]

That makes sense for GNU grep. Do note that BSD grep (which ships with macOS) behaves differently:

-Z, -z, --decompress
         Force grep to behave as zgrep.

Neither grep uses -0. I'm fine with -Z too though.

[BurntSushi]

Yuck. I'd like ripgrep to support decompression some day. I still lean towards -Z... However, -0 also has precedent, e.g., with xargs.