FrSky ETHOS Rename Sticks and Inputs as Joystick Names TANDEM X18 X20 XE

Renaming the sticks and inputs for standard Joystick style naming convention.
For users who program our radios for robotics, animatronics, boats, ground vehicles, etc., the typical "aeronautical" name conventions of Aileron, Elevator, Throttle and Rudder may not be intuitive for programming the ETHOS systems.
This intends to make the sticks and switches a bit more identifiable by their position rather than their assignment by Radio Mode function.