Refactor ziputils

[rpatters1]

• refactor ziputils into ziputils and enigmaxml libraries
• refactor both to use client library for managing dependencies like luaosutils
• refactor PowerShell commands to work with io.popen as well as luaosutils.process.execute
• PowerShell script for calc_gunzip_command now returns raw decompressed bytes in stdout.
• other minor changes as part of refactor

I wonder is the reason "%s" works now (and & { %s } doesn't) is because all the commands are on a single line now. (This is to accommodate io.popen which apparently doesn't work with embedded newlines.)

[asherber]

I don't think that's the issue, but I'll try some tests later, just for my own edification.

[rpatters1]

FWIW: When I change it to & { %s }, the command emits the powershell help page.

[rpatters1]

It works the same irrespective of calling luaosutils or io.popen. That is, the current version works and the & { %s } version emits the help page.