Metabolism refactor (#4395)

* metabolism -> respirator, add reageanteffect and reagenteffectcondition, start on metabolizercomp/system

* move LiverBehavior metabolism logic to Metabolizer

* minor tweaks and update all YAML

* how about actually taking conditions into account

* off by one

* removals

* reviews

Content.Shared/Body/Metabolism/ShiverAttemptEvent.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Body.Metabolism
+{
+    public class ShiverAttemptEvent : CancellableEntityEventArgs
+    {
+        public ShiverAttemptEvent(IEntity entity)
+        {
+            Entity = entity;
+        }
+
+        public IEntity Entity { get; }
+    }
+}

Content.Shared/Body/Metabolism/SweatAttemptEvent.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Body.Metabolism
+{
+    public class SweatAttemptEvent : CancellableEntityEventArgs
+    {
+        public SweatAttemptEvent(IEntity entity)
+        {
+            Entity = entity;
+        }
+
+        public IEntity Entity { get; }
+    }
+}