Update ventilator with latest Pulse API

See merge request !22

Update ventilator trigger/drug logic

Add Units to the data request plots

- Display I:E ratio as a ratio
- Change cStatic to cDynamic
Properly update ventilator UI when loading a state with the ventilator on
- Note, Pulse needed to be updated for this to happen

Add signing script to version control

See merge request !21

Used to sign DMG files following internal instructions.
Add a README file with some notes about getting ready to sign.

Update to Pulse 4.2.0

See merge request !19

Sync data request ui with physiology scalars

See merge request !18

Pretty printing actions to the UI log and scenario tab

Pulse Engine 4.x Updates

See merge request !17