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/Groups/groups.yml

@@ -176,7 +176,9 @@
   - fillgas
   - listgases
   - removegas
+  - clearatmos
   - settemp
+  - setatmostemp
   CanViewVar: true
   CanAdminPlace: true
   CanScript: true