Adds ISuicideAct and support for Held Item and Environmental suicides (#1010)

Content.Server/Interfaces/GameObjects/ISuicideAct.cs

@@ -0,0 +1,26 @@
+using Content.Server.Interfaces.Chat;
+using Robust.Shared.Interfaces.GameObjects;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Content.Server.Interfaces.GameObjects
+{
+    public interface ISuicideAct
+    {
+        public SuicideKind Suicide(IEntity victim, IChatManager chat);
+    }
+
+    public enum SuicideKind
+    {
+        Special, //Doesn't damage the mob, used for "weird" suicides like gibbing
+
+        //Damage type suicides
+        Brute,
+        Heat,
+        Cold,
+        Acid,
+        Toxic,
+        Electric
+    }
+}