Make slow spacing variables CCVars (#19862)

Content.Shared/CCVar/CCVars.cs

@@ -959,6 +959,28 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<bool> AtmosGridImpulse =
             CVarDef.Create("atmos.grid_impulse", false, CVar.SERVERONLY);
 
+        /// <summary>
+        ///     What fraction of air from a spaced tile escapes every tick.
+        ///     1.0 for instant spacing, 0.2 means 20% of remaining air lost each time
+        /// </summary>
+        public static readonly CVarDef<float> AtmosSpacingEscapeRatio =
+            CVarDef.Create("atmos.mmos_spacing_speed", 0.05f, CVar.SERVERONLY);
+
+        /// <summary>
+        ///     Minimum amount of air allowed on a spaced tile before it is reset to 0 immediately in kPa
+        ///     Since the decay due to SpacingEscapeRatio follows a curve, it would never reach 0.0 exactly
+        ///     unless we truncate it somewhere.
+        /// </summary>
+        public static readonly CVarDef<float> AtmosSpacingMinGas =
+            CVarDef.Create("atmos.mmos_min_gas", 2.0f, CVar.SERVERONLY);
+
+        /// <summary>
+        ///     How much wind can go through a single tile before that tile doesn't depressurize itself
+        ///     (I.e spacing is limited in large rooms heading into smaller spaces)
+        /// </summary>
+        public static readonly CVarDef<float> AtmosSpacingMaxWind =
+            CVarDef.Create("atmos.mmos_max_wind", 500f, CVar.SERVERONLY);
+
         /// <summary>
         ///     Whether atmos superconduction is enabled.
         /// </summary>