Varied and semi-sprited atmos markers (#4944)

Content.Server/Atmos/Components/AtmosFixMarkerComponent.cs

@@ -0,0 +1,21 @@
+using Content.Server.Atmos.EntitySystems;
+using Content.Server.Temperature.Components;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.Atmos.Components
+{
+    /// <summary>
+    /// Used by FixGridAtmos. Entities with this may get magically auto-deleted on map initialization in future.
+    /// </summary>
+    [RegisterComponent]
+    public class AtmosFixMarkerComponent : Component
+    {
+        public override string Name => "AtmosFixMarker";
+
+        // See FixGridAtmos for more details
+        [DataField("mode")]
+        public int Mode { get; set; } = 0;
+    }
+}