AtmosDevices can optionally process in space. (#4405)

Refactors some misc atmos things, too.

Content.Server/Atmos/Components/SpaceAtmosphereComponent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Atmos.Components
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(IAtmosphereComponent))]
+    public class SpaceAtmosphereComponent : Component, IAtmosphereComponent
+    {
+        public override string Name => "SpaceAtmosphere";
+
+        public bool Simulated => false;
+    }
+}