Add control protocol

[dsferruzza]

• add every settings in ControlSetting
• check the assumption that every setting can be expressed as a u16
• generate random control messages
• implement parser in the firmware

[Benhalor]

Right now, your Available settings in the control protocol are :
PeakPressure [0 - 700 mmH2O]
PlateauPressure [100 - 400 mmH2O]
PEEP [0 - 300 mmH2O]
CyclesPerMinute [5 - 35 cpm]
ExpiratoryTerm (is that PlateauDuration ?) [500 - 5000 ms]

I would add immediately:
I/E ratio [?]
TriggerEnabled [YES - NO]
TriggerOffset [0 - 100 mmH2O]

And for the future :
expiratoryTrigger [0 - 100%]
Vt [0 - 1200 mL]