upower backend for battery widget WIP#266

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eylles wants to merge 3 commits intostreetturtle:masterfrom

eylles:battery-backend

Commits on May 24, 2021

upower backend for battery widget
eylles
committed

Commits on May 25, 2021

use time to full charge to decide if charging icon, cleaned up upower call
eylles
committed

Commits on Dec 13, 2021

added notification with upower backend
eylles
committed