add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 49ac0e0470ec6367f720c7b79a09165138f57b60f5949a2d9c38be5823d13294 libshairplay-ce80e005908f41d0e6fde1c4a21e9cb8ee54007b.tar.gz