* Flysky Hall Stick MOD using UART4 by disabling stick A/D.
* Fixed build error.
* Added Flysky hall stick mod in test targets.
* Changed ADC disable for Flysky hall sticks method.
Added support for:
- T16 radio
- internal multi-protocol module.
- flashing internal and external multi-protocol modules.
Many thx to:
- goebish, for the hardware support.
- qba667, for the original patches for the internal multi-protocol support (UI and serial com).