Changing method move from syringe_filled to start_exchange to make it easier to use (and more adapted to our need now.

The problem was that i diddn't get the usefulness af the former attribute
retain_accel, which is useful for the use of the limit switch, I change
back the name and rename move_to_mm to move_to_mm_limit_switch and
move_mm to move_to_mm

Fixing arduinoson problems by using singletons for syringe and syringefilled instead of static members.

Adding fuction of the cli interface : FS-SAVE and FS-LOAD to manage the syringyge_filled_json ducument

Every compilation problem have been resolved but the syringe pump does not work with the we interface

Changing id_syringe to name_syringe and also change type from Syringe* to String and do all the changes going with it

Correection of the way to use arduinoJson structure, and cretio of a name attribute to use it as the key

 Deletion of setupJsonSyringe(filled) methods because they are repetitive of setter methods and would be called in the constructor, we don't need another method to do it.

manage_emergency to take it into account.

Creation of methods move (which manage movement of the motor) and volume_to_distance which convert a volume to a distance from the syringe model.