Unique gas serialization for atmos (#1629)

* Add unique gas mixture serialization for atmos

* Refactor doAfterEventArgs

* Adds atmos commands

* Roundstard now has correct ratio of gases

* Fixed hashcode for gasmixture, better grid atmos serialization

* Airlocks create gas based on adjacent tiles now.

* Enables barotrauma component damage

Resources/Prototypes/Entities/Constructible/Doors/airlock_base.yml

@@ -52,6 +52,7 @@
     - key: enum.WiresUiKey.Key
       type: WiresBoundUserInterface
   - type: Airtight
+    fixVacuum: true
     adjacentAtmosphere: true
   - type: Occluder
   - type: SnapGrid