add: defaultCalibration.cpp to Turnigy-MEGA200 provided by Jozef
x1
 add: defaultCalibration.cpp to Turnigy-MEGA400 provided by Jozef
add: hex files for Turnigy MEGA200 and MEGA400
name correction: Jozsef N.
x4
Merge https://github.com/stawel/cheali-charger