Add the checkbox setting for automatic connection to ADC

[GrazianoCapelli]

Now the app is set to auto connect / reconnect to the ADC.
We should add the setting to enable / disable this feature. When the feature is disabled, the user should be able to manually connect / disconnect the app to the ADC.

[GrazianoCapelli]

I'm thinking about this topic.
Maybe the best choice is to Always search for the connection, in order to connect automatically to the device when available.

If the user doesn't want to connect to the ADC, he can simply disable the Bluetooth service of the Android device.