Toggle airplane mode instead of just Data or WiFi

[Siltaar]

In addition of the current Data and WiFi cutting-off capabilities, I would enjoy a setting: [] Toggle data [] Toggle WiFi [] Toggle airplane mode

Turning airplane mode on would save a lot more battery.

~~It would require a 5min (or 7min) downtime option (instead of the current 15min minimum) to be perfect.~~ -> This have been accepted with the following merge request: https://github.com/tobykurien/BatteryFu/commit/6a3d3512f487bab78e9d83fc145546923b229ded

Currently, this could be achieve with Automation from F-Droid https://f-droid.org/en/packages/com.jens.automation2/ and it effectively saves battery. But Automation is not working reliably on Android 12, while I managed to get BatteryFu perfectly running (removing battery optimization and restrictions from Android point of view).