SIMD-accelerated gas mixtures. (SIMD atmos) (#2479)

* SIMD atmos

* Moles will always be a multiple of four.

* Component dependencies for grid atmos.

* Let's optimize allocations while we're at it!

* Inline this

* A bunch of atmos optimizations

* Fix crimes against atmos

* Microsoft moment

* Remove nuget.config

* do not reference Robust.UnitTests in Content.Benchmarks as it's unneeded.

* Revert "Remove nuget.config"

This reverts commit 872604ae6a51365af4075bb23687bd005befd8ac.

* Gas overlay optimization and fixes

* Lattice is now spess

* minor atmos tweaks

Content.Shared/Maps/ContentTileDefinition.cs

@@ -25,6 +25,7 @@ namespace Content.Shared.Maps
         public float Friction { get; set; }
         public float ThermalConductivity { get; set; }
         public string ItemDropPrototypeName { get; private set; }
+        public bool IsSpace { get; private set; }
 
         public void AssignTileId(ushort id)
         {
@@ -47,6 +48,11 @@ namespace Content.Shared.Maps
             else
                 BaseTurfs = new List<string>();
 
+            if (mapping.TryGetNode("is_space", out node))
+            {
+                IsSpace = node.AsBool();
+            }
+
             if (mapping.TryGetNode("can_crowbar", out node))
             {
                 CanCrowbar = node.AsBool();