vlib: add compress/szip module

[StunxFS]

This PR adds the compress/zip module, and deprecates the szip module.

[JalonSolov]

Hmm... I think I'd prefer this as compress/szip... so basically just moving the files, rather than renaming them.

If V ever gets a zip module that is the archive format, it should have the zip name, not a gzip type compression module.

[StunxFS]

@JalonSolov Ok, it seems logical to me. I have changed the module name to szip.

[spytheman]

I fail to see the difference?

vlib/szip can read/write .zip files, not sure if all of them, but enough to be able to open .apk or Excel .xlsx ones, and those are also using the PKZip container format described here https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip.html .