Gas tanks and masks (#2409)

Co-authored-by: a.rudenko <creadth@gmail.com>
Co-authored-by: creadth <creadth@users.noreply.github.com>
Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Server/GameObjects/EntitySystems/GasTankSystem.cs

@@ -0,0 +1,32 @@
+using System;
+using Content.Server.GameObjects.Components.Atmos;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects.EntitySystemMessages;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Interfaces.Timing;
+using Robust.Shared.IoC;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class GasTankSystem : EntitySystem
+    {
+        private float _timer = 0f;
+        private const float Interval = 0.5f;
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            _timer += frameTime;
+
+            if (_timer < Interval) return;
+            _timer = 0f;
+
+            foreach (var gasTank in EntityManager.ComponentManager.EntityQuery<GasTankComponent>())
+            {
+                gasTank.Update();
+            }
+        }
+    }
+}