BAR power notifier

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A notifier has been installed in the bar. This will send a message in the IRC-channel when the power for the airfryer/pizza oven has been on for > 2 hours because that can be an indication that someone forgot to switch of the pizza oven. Don't run immediately to the space to fix this, please run "!power -v" in irc first to see if "Kitchen Counter" is using lots of power (> 25 watt).

The notifier is a simple esp8266 that sends a heartbeat message via mqtt. Then on harkbot.vm.nurd.space a script is running which checks for this heartbeat.