Added wakeup code for cameras in flight phase 2

- experiencing some unexpected shutdown with FCOEV2 in photo serial
mode, action is toggled periodically to wake up cameras
Added rotor code

- SERVO_PWM_PIN has been renamed ROTOR_PWM_PIN
- added Rotor.h and Rotor.cpp to handle 3-positions rotor
- updated application code
Changed flight phase pause and duration constants, updated flight phase
2 camera code
Updated Kiwi frame transmission

- kiwi frame is now transmitted 3 times, with a pause of 250 ms between
frames