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/Atmos/Atmospherics.cs

@@ -138,6 +138,11 @@ namespace Content.Shared.Atmos
         /// </summary>
         public const float MinimumHeatCapacity = 0.0003f;
 
+        /// <summary>
+        ///     For the purposes of making space "colder"
+        /// </summary>
+        public const float SpaceHeatCapacity = 7000f;
+
         #region Excited Groups
 
         /// <summary>