[Plasmoid] Use icon for battery and connectivity status

## Summary

Use a pretty, granular icon for battery and connectivity status instead of whacking it into the device name.

## Test Plan

It looks so nice!

![image](/uploads/7e64d1339507e1dae90ee70c02327aa6/image.png)

Tested all provided icon states by hacking Battery.qml and Connectivity.qml to provide different values.