Adds barotrauma (pressure damage) (#1605)

* Adds barotrauma, disables it for now

* At least show status effect, but don't damage the mobs

* Fix switch misuse

Content.Server/Interfaces/GameObjects/IPressureProtection.cs

@@ -0,0 +1,8 @@
+namespace Content.Server.Interfaces.GameObjects
+{
+    public interface IPressureProtection
+    {
+        public float HighPressureMultiplier { get; }
+        public float LowPressureMultiplier { get; }
+    }
+}