PWM: rename Servo_Example to robot

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
robot.py: port to PoMoCo API

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Example.py: example move using PoMoCo API
robot.py: add missing servo indeces

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>