Add airplane mode feature

[evergreen22]

# Add airplane mode feature

Refactor the code for style in preparation for adding an airplane mode feature. More design work needs to be done.

[yehoshuapw]

Maybe recovery should ignore this, otherwise if there is some error, while this is on - you cannot update the firmware over Bluetooth.

[ItzSwirlz]

I personally think we just need better options with the Bluetooth (choose connections to connect to). It would make things easier

[Itai-Nelken]

The 'firmware' and 'about' settings sbould be at the bottom as they are the least used setting in my opinion.

[lman0]

@evergreen22 can you add a plane icon when in "airplane mode" that replace the bluetooth icon?
in the the digital watchface first (and maybe other watch if you want/can ).

thanks

the reason :
because , when i on a plane i deactivate the bluetooth of my phone , then the bluetooth icon disappear on infinitime yet it's still advertise.
having a icon for airplane mode would be helpfull and less stressfull (i would not have to check every time if i'm on airplane mode , in the seting)

[uis246]

I personally think we just need better options with the Bluetooth (choose connections to connect to). It would make things easier

From my comment under issue:

I think there will several modes: "noisy"(with adv), normal(without adv), quiet(if possible to use rx only) and disabled.