Swap mac keyboard option and command

Swap the mac keyboard option and command keys, and enable function keys without the need to press fn first.

Add the following line to the i3 config.

/usr/lib/systemd/system/mac-keyboard.service

[Unit]
 Description=mac-keyboard
[Service]
 Type=oneshot
 ExecStart=/bin/sh -c "echo 1 > /sys/module/hid_apple/parameters/swap_opt_cmd && echo 2 > /sys/module/hid_apple/parameters/fnmode"
 ExecStop=/bin/sh -c "echo 0 > /sys/module/hid_apple/parameters/swap_opt_cmd && echo 1 > /sys/module/hid_apple/parameters/fnmode"
 RemainAfterExit=yes
[Install]
WantedBy=multi-user.target

systemctl --system daemon-reload

systemctl start mac-keyboard.service

systemctl enable mac-keyboard.service