Create "Application" class.
Small modification on RadioLink for the CrazyflieApp.
Import and use the IController to the Application class.
Rename the controller to mController.
Remove RadioLink code from main activity.
Add disable Function to IController.
Implement Connectionlistener in main Activity and add to the
CrazyFlieApp.java
Set default preference values to PreferenceManager in CrazyflieApp
Move the usb broadcast receiver from the activity to an external class