Ratchanan Srirattanamet authored Jul 02, 2023 and Mike Gabriel committed Aug 28, 2023

ayatana-indicator-battery 23.6.0 stops providing battery level through
the action. Instead, the level is provided through menu's attribute.
That means we'll to retrive the battery level somewhere else.

Since we already talk to UPower for battery history, let's just talk to
UPower directly for plugged-in state and charge level. This means we'll
lose the indicator's logic for selecting primary battery, but I guess
they have different priorities anyway (e.g. we probably don't care about
accessories' batteries).

The code is re-structued a bit so that there's a dedicated object
representing a battery. This is done so that we can support multiple
batteries in the future - even though we're still lacking in this
regards...

Fixes: https://gitlab.com/ubports/development/core/lomiri-system-settings/-/issues/355