Now the enable of the steppers is not done at start() but instead is triggered via arm() method.
Also, now the SMController does trigger the arm() and disarm() methods in the macro-states with or without feedback.

Now all the algorithms are manually stepped inside the update function
and treated as a pipeline.

Now an explicit NACK is sent in case the steppers cannot be actuated (e.g. disarmed or other reasons) or actuated in a non-expected way (limited actuation)

Tested with the F767ZI nucleo board

needs testing

- This introduce compiler conditional compilation (based on
architecture), this fix previous issue with building
- Leds now is thread safe, uses a low priority scheduler and keep tasks
alive if leds needs non-blocking blinking

Removed it and passed by reference

Hub now interfaces to SMController and not Actuators directly

Now update the Propagator with NAS state stored by Hub and set as the
Follower NAS target the predicted one of the Propagator.