v1.5.0

• rework pressure and blower control
  (blower will now take more time to ramp up/down but this will greatly improve the stability of injected air volume in many scenario)
• rework alarms
  (better pressure alarms, better battery alarms, better snooze behavior)
• improve even more the measured and displayed pressures
  (if no plateau pressure if found, screen will now display a ? instead of an uncertain value)
• tweak the pressure control to make the plateau more accurate
• fix an issue with blower not restarting in some cases
• make sysclock more accurate
• improve code quality (MISRA)
• add a step in integration test to check O2 pipe