= quite a few changes...

- mixer tracks rx readings to ensure servo limits don't exceed rx limits.
- replaced mix_mode and ail_mode with wing_mode.
- stick config support
- eeprom config support
> default parameters setup
- used ICP pin for CPPM in rx3s v1/v2
- attitude estimation by summing rate
- 2 pid computations: attitude and rate
> 2 separate pid parameter records
- eeprom config: removed pid parameters.
- stick configuration
- WDT method to reboot the device after stick config
- cppm handling. wait for first sync pulse before updating vars.
- fixed minor bug to call calibration_set_led when rx or imu calibration_updated called.