Split BluetoothDevice into BluetoothDevice and BluetoothAdapter.
BluetoothAdapter: Represents the local BT adapter. Operations on the local
adapter (start a scan, etc).
BluetoothDevice: Represents a remote BT device. Operations on remote devices
(pair, connect, etc).
- Changed the Passkey confirmation to show Pair/Don't Pair.
- Fixed the problem where the Ok button was showing up as Pair for the error dialog box.
- Disable the toasts when pairing failed in this case. Will need to check if this causes regression in other cases.
