[main] Add battery indicator and refresh

[david-caro]

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This adds a simple text battery indicator that is refreshed every 10 minutes to keep track of the battery level of the device.

I will try to add an auto-sleep if there's no activity also, so it does not drain the battery when left by itself, but that will come later.

[david-caro]

Btw. I'm quite new to both, C++ and QT, so any suggestions on how to improve it are welcome :)

[dixonary]

Looks good! I'm afraid I'm a little busy right now (and away from my rM), but this may make a nice addition. I'll test it on my device ASAP.

[sudocurse]

i meant to test this out two years ago 💀 did this ever get implemented elsewhere?

[Eeems]

i meant to test this out two years ago 💀 did this ever get implemented elsewhere?

I used it for inspiration in early Oxide development.