Misc Atmos Improvements (#5613)

* Revert "Remove atmos archiving."

This reverts commit 7fa10bd17b.

* Explosive Depressurization now brings tiles down to TCMB.

* Tiles now specify heat capacity.

* Do not serialize archived gas mixture values.

* Remove bad idea

* dumb typo

* Space gas mixtures now have a harcoded heat capacity.
This is a bit of a hack, but rooms exposed to space now cool down properly when monstermos is disabled.
Huge thanks to @LemonInTheDark for helping me with this!

* Clean up heat capacity methods

* Better logging based on the original monstermos' logging

* Comment explosive depressurization hack better

Content.Shared/Maps/ContentTileDefinition.cs

@@ -6,6 +6,7 @@ using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using Robust.Shared.ViewVariables;
 using System.Collections.Generic;
+using Content.Shared.Atmos;
 
 namespace Content.Shared.Maps
 {
@@ -38,6 +39,9 @@ namespace Content.Shared.Maps
 
         [DataField("thermalConductivity")] public float ThermalConductivity { get; set; } = 0.05f;
 
+        // Heat capacity is opt-in, not opt-out.
+        [DataField("heatCapacity")] public float HeatCapacity = Atmospherics.MinimumHeatCapacity;
+
         [DataField("item_drop", customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
         public string ItemDropPrototypeName { get; } = "FloorTileItemSteel";