add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 7ee78ff5c24e3f81b6e2a9208237f34667cb9faa5453d7bdb900ab65245973f1  kodi-visualisation-spectrum-v1.1.1.tar.gz