[enhancement] - multiple devices in power usage screen

[laurenssss]

option to add multiple devices to the power usage page

e.g. the following: 1 - general power measuring device (like toon or p1 device) 2 - specific device you want to monitor 3 - power generating devices like solar panels

in 1 overview

[swttt]

Waiting on Athom for implementing some features to get better data from insights before continuing with this plugin.