power: Low power notifications
This is a partial fix for #686 (closed), which changes the notification text. The main goals are to:
- avoid repetition, such as the identical "battery critically low" headings, and the "shutting down soon" / "about to shutdown"
- remove ambiguity where possible, such as the "shutting down soon"
- where possible, prioritise the battery percentage, since this is what actually determines when the notification is shown
- avoid using the time estimates, since they're often inaccurate
The notifications currently look like:
After the MR they look like:
I'd like to change the icons as well, so they look like this:
That could happen separately from this MR, or with it, but it will require someone with more coding skills than me.