robot.py: fix looptiming

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Example.py, MoveForward.py: adjust for looptiming bugfixes

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
robot.py: fix neck servo assignment

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