functions: implement a environment file parser

This adds a 'parse_envfile' function that reads files such as
/etc/locale.conf and /etc/vconsole.conf without sourcing them as bash
logic. Several benefits are realized from this:

- Impossible to execute arbitrary code
- Bad syntax won't prevent the entire file from being read
- Possible to limit what variables are allowed

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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