* nrf5/examples: Adding python example template for PowerUp 3.0 Bluetooth LE controlled Paper Airplane.
* nrf5: Enable bluetooth le central while developing powerup 3.0 example.
* nrf5/examples: Backing up powerup 3.0 progress.
* nrf5/examples: Adding working example on how to control PowerUp 3.0 paper airplane using bluetooth le.
* nrf5/bluetooth: Disable central role.