Support for 7z, xz, zip and rar

[Zer0-Tolerance]

Hi Liz,
Great tool ! Do you think you can add quickly the support of other type of compressed archive ?
This would be good for --auto-decompress of feature of Rak.
I've opened another dedicated issue on the relevant lib.

[lizmat]

I seem to have lost context on this issue. Which issue / library where you thinking about?