Adds tritium fire reaction and water vapor, fix gas reactions (#1623)

hehe Tritfire go BRRRR

Resources/Prototypes/Atmospherics/gases.yml

@@ -31,3 +31,11 @@
   gasOverlaySprite: /Textures/Effects/atmospherics.rsi
   gasOverlayState: tritium
   color: 13FF4B
+
+- type: gas
+  id: 5
+  name: Water Vapor
+  specificHeat: 40
+  gasOverlaySprite: /Textures/Effects/atmospherics.rsi
+  gasOverlayState: water_vapor
+  color: bffffd

Resources/Prototypes/Atmospherics/reactions.yml

@@ -9,3 +9,16 @@
     - 0.01  # phoron
   effects:
     - !type:PhoronFireReaction {}
+
+- type: gasReaction
+  id: TritiumFire
+  priority: -1
+  minimumTemperature: 373.149 # Same as Atmospherics.FireMinimumTemperatureToExist
+  minimumRequirements: # In this case, same as minimum mole count.
+    - 0.01  # oxygen
+    - 0     # nitrogen
+    - 0     # carbon dioxide
+    - 0     # phoron
+    - 0.01  # tritium
+  effects:
+    - !type:TritiumFireReaction {}