Make atmos Turing-complete (#10520)

* Add pneumatic valves

Pneumatic valves permit bidirectional flow between the inlet and outlet
if the pressure at the control port is high enough.

* Add construction recipe

Resources/Prototypes/Recipes/Construction/Graphs/utilities/atmos_trinary.yml

@@ -16,6 +16,12 @@
         amount: 2
         doAfter: 1
 
+    - to: pneumaticvalve
+      steps:
+      - material: Steel
+        amount: 2
+        doAfter: 1
+
   - node: filter
     entity: GasFilter
     edges:
@@ -47,3 +53,19 @@
       steps:
       - tool: Welding
         doAfter: 1
+
+  - node: pneumaticvalve
+    entity: PressureControlledValve
+    edges:
+    - to: start
+      conditions:
+      - !type:EntityAnchored
+        anchored: false
+      completed:
+      - !type:SpawnPrototype
+        prototype: SheetSteel1
+        amount: 2
+      - !type:DeleteEntity
+      steps:
+      - tool: Welding
+        doAfter: 1

Resources/Prototypes/Recipes/Construction/utilities.yml

@@ -12,7 +12,7 @@
     state: camera
   objectType: Structure
   placementMode: SnapgridCenter
-  
+
 - type: construction
   name: telescreen
   id: WallmountTelescreen
@@ -511,3 +511,17 @@
   conditions:
     - !type:TileNotBlocked {}
 
+- type: construction
+  id: PressureControlledValve
+  name: pneumatic valve
+  graph: GasTrinary
+  startNode: start
+  targetNode: pneumaticvalve
+  category: Utilities
+  placementMode: SnapgridCenter
+  canBuildInImpassable: false
+  icon:
+    sprite: Structures/Piping/Atmospherics/pneumaticvalve.rsi
+    state: off
+  conditions:
+    - !type:TileNotBlocked {}