Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

pkgbase: Remove libefivar package and add a efi-tools one

Put all the efi related tools into FreeBSD-efi-tools.

Differential Revision: https://reviews.freebsd.org/D31803

Add efitable(8), a userspace tool to fetch and parse EFI tables

Only ESRT and PROP tables are handled at the moment.

Submitted by: Pavel Balaev <pavel.balaev@3mdeb.com>
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D30104