Let the NAO look up!

[tuxbotix]

Currently we have a hard head pitch limit disabling looking up. crates/control/src/motion/head_motion.rs:113

I am aware that this limit has been there for various reasons in the past. However, this makes automatic calibration hard to achieve as the field area that can be seen by both cameras with the pitch limits is very small -> can't see full center circle.

How? Options:

• adjustable head pitch limit -> parameter?
• Allow negative value within reason -> clamp yaw values when pitch is negative
• Allow negative only in calibration?

Otherwise I'll have to directly dispatch commands which defeats the whole purpose of the look_at mechanism.