Move GasMixture to shared (#27480)

* Moved GasMixture to shared

* Temp Fix for sandbox violation, idk why Array.Resize isn't working properly. It's already sandboxed.

* The most powerful webedit in history

Content.Server/Lathe/LatheSystem.cs

@@ -8,6 +8,7 @@ using Content.Server.Materials;
 using Content.Server.Power.Components;
 using Content.Server.Power.EntitySystems;
 using Content.Server.Stack;
+using Content.Shared.Atmos;
 using Content.Shared.UserInterface;
 using Content.Shared.Database;
 using Content.Shared.Emag.Components;