by Lukáš Uher
Shows battery level as a bar and charging state as an icon in notification. It's recommended to set notification channel with "minimalized" and "silent" settings to have a nice tiny strip in notif list.
v2: possible to show/hide source details in notif content - setting showSourceDetails variable to 1 or 0.
v3: added second flow start to show popup message instead notification.
v4: little improvement in content design.
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