Atmos Debug Overlay expansion (#2626)

* Atmos Debug Overlay: Add a way of showing blocked directions

* Atmos Debug Overlay: Adjustable modes client-side

* Atmos Debug Overlay: Fix atvrange help text

* Atmos Debug Overlay: More flexible and clear gas ID specification

Content.Client/GameObjects/EntitySystems/AtmosDebugOverlaySystem.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using Content.Client.Atmos;
 using Content.Shared.GameObjects.EntitySystems.Atmos;
+using Content.Shared.Atmos;
 using Content.Shared.GameTicking;
 using JetBrains.Annotations;
 using Robust.Client.Interfaces.Graphics.Overlays;
@@ -20,6 +21,19 @@ namespace Content.Client.GameObjects.EntitySystems
         private readonly Dictionary<GridId, AtmosDebugOverlayMessage> _tileData =
             new();
 
+        // Configuration set by debug commands and used by AtmosDebugOverlay {
+        /// <summary>Value source for display</summary>
+        public AtmosDebugOverlayMode CfgMode;
+        /// <summary>This is subtracted from value (applied before CfgScale)</summary>
+        public float CfgBase = 0;
+        /// <summary>The value is divided by this (applied after CfgBase)</summary>
+        public float CfgScale = Atmospherics.MolesCellStandard * 2;
+        /// <summary>Gas ID used by GasMoles mode</summary>
+        public int CfgSpecificGas = 0;
+        /// <summary>Uses black-to-white interpolation (as opposed to red-green-blue) for colourblind users</summary>
+        public bool CfgCBM = false;
+        // }
+
         public override void Initialize()
         {
             base.Initialize();
@@ -83,4 +97,11 @@ namespace Content.Client.GameObjects.EntitySystems
             return srcMsg.OverlayData[relative.X + (relative.Y * LocalViewRange)];
         }
     }
+
+    internal enum AtmosDebugOverlayMode
+    {
+        TotalMoles,
+        GasMoles,
+        Temperature
+    }
 }