Replace naive string quoting with lib.escapeShellArg for proper shell escaping
of special characters, spaces, and quotes. Integrate with new formatShellArrayContent
for intelligent multi-line array formatting in zsh array definitions.
Signed-off-by: Austin Horstman <khaneliman12@gmail.com>
Added utilities to generate export statements and definitions for zsh scripts.
Currently, there is only lib.shell which generates export statements in bash
syntax. However, this does not allow to generate export statements for zsh
arrays (syntax: NAME=(elem1 elem2 ...) ), which would be the natural
representation of lists in the nix language.
