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

Content.Server/Atmos/Piping/Trinary/Components/PressureControlledValveComponent.cs

@@ -0,0 +1,35 @@
+using Content.Shared.Atmos;
+
+namespace Content.Server.Atmos.Piping.Trinary.Components
+{
+    [RegisterComponent]
+    public sealed class PressureControlledValveComponent : Component
+    {
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("inlet")]
+        public string InletName { get; set; } = "inlet";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("control")]
+        public string ControlName { get; set; } = "control";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("outlet")]
+        public string OutletName { get; set; } = "outlet";
+
+        [ViewVariables(VVAccess.ReadOnly)]
+        [DataField("enabled")]
+        public bool Enabled { get; set; } = false;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("gain")]
+        public float Gain { get; set; } = 10;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("threshold")]
+        public float Threshold { get; set; } = Atmospherics.OneAtmosphere;
+
+        [DataField("maxTransferRate")]
+        public float MaxTransferRate { get; set; } = Atmospherics.MaxTransferRate;
+    }
+}