Ble banner
Remove old BLE code, use simpler banners
This PR fixes the issue where the Bluetooth code frame doesn't disappear when pairing is complete. Not it no longer uses a frame, it instead shows the pairing code as a notification and disappears properly when connected device is paired. Tested on Heltec V3, T114, L1, Meshtiny, and RAK4631.
My only issue with this change is that on smaller screens, the BLE pin is harder to see than the classic. Does the banner overlay support larger fonts?
Tested on MeshTiny and Wio Tracker L1 Pro - no issues here. @thebentern no we don't currently support larger fonts in the popups.
I do wonder if we could check if the bigger font would fit, and use it if it fits