Add grubenv containing GRUB environment variables

In order to mitigate issues concerning end-users making their system
unbootable by misconfiguring grub.cfg, an environment file is provided
with the intent being to direct users to edit that file instead of
grub.cfg.  Thus, consequences of misconfiguration are lessened.

Of course, users looking to make more extensive changes than setting
environment variables used by either GRUB (internally) or in grub.cfg
will still need to edit their grub.cfg.

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