Airway/Breathing/Circulation - Add ETCo2 Monitor

[apo-tle]

When merged this pull request will:

• Add ETCo2 level to Vitals Monitor. ETCo2 level can be used to diagnose respiratory events such as airway blockages and PTX deterioration, as well as cardiac arrest
• Add Respiratory Rate to Vitals Monitor. Respiratory Rate can be used in conjunction to ETCo2 level to diagnose problems with a patient's airway.
• ETCo2 level and Respiratory Rate have no effect on any stats behind resuscitating a patient, instead serving as indicators to allow doctors to spot issues more easily.
• Add Nasal Cannula. Nasal Cannula will be required to be attached to a patient's head in order for ETCo2 and Respiratory Rate readouts to be visible on the Vitals Monitor. You will not be able to use the Nasal Cannula to provide a patient with oxygen.

  To Do

• [x] Implement Respiratory Rate
• [x] Implement Nasal Cannula
• [x] Remove ETCo2/RR readouts when Nasal Cannula is not connected
• [x] Add setting to allow ETCo2/RR readouts to be displayed
• [x] Remove debugging code and tidy up

IMPORTANT

• [x] Development Guidelines are read, understood and applied.
• [x] Title of this PR uses our standard template Component - Add|Fix|Improve|Change|Make|Remove {changes}.

[apo-tle]

To Do for Nasal Cannula

• [x] Add Nasal Cannula label to head quick view
• [x] Add Nasal Cannula to log when inserted
• [x] Change VM so ETCo2 level only appears with nasal cannula attached
• [x] UI element for Nasal Cannula (need support for this)

[Ghostworrior]

Etco2 should display with either nasal cannula or KingLT in place (if I or someone else ever gets to do the airway rework) other items would be added as well.

Etco2 under good CPR should be ~15 rather than the 10 it is currently. With high blood loss, etco2 should drop even under CPR to 5-10. If CPR is performed on a patient with circulation it should still show 35-45 as a value, but RR should be fixed at 10 ventilations while doing CPR or using a BVM.

Small idea on the side increase etco2 and decrease RR if lorazepam, fentanyl or morphine is used. Not 100% realistic, but easiest way to implement/show side effects.

Also change etco2 and RR in correlation to pH if it's in use, the lower pH value the higher RR and etco2.

Just my two cents after looking over the code, all in all I like the system, good work. Will gladly test it in game once It's either ready or I figure out how to do Git stuff again...

[apo-tle]

Etco2 under good CPR should be ~15 rather than the 10 it is currently. With high blood loss, etco2 should drop even under CPR to 5-10. If CPR is performed on a patient with circulation it should still show 35-45 as a value, but RR should be fixed at 10 ventilations while doing CPR or using a BVM.

Currently etco2 under CPR changes based on how deteriorated a patient's cardiac arrest is, starting at 10 and increasing to 16 as compressions move from asystole -> VT. My idea behind this was to simulate etco2 continually increasing as good cpr is performed. I'll adjust values to decrease etco2 further for blood loss.

[apo-tle]

ETCo2 Monitor is all done and ready for a final review.

[mazinskihenry]

LGTM