Add xenos (#1204)

* Add xenos for stress test

Pretty hacky and not how I'd do it long-term

* Remove claws

* Add in unarmed combat behaviors

* Cleanuppppp

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/AI/Utility/BehaviorSets/UnarmedAttackPlayersBehaviorSet.cs

@@ -0,0 +1,17 @@
+using Content.Server.AI.Utility.Actions;
+using Content.Server.AI.Utility.ExpandableActions.Combat.Melee;
+using Robust.Shared.Interfaces.GameObjects;
+
+namespace Content.Server.AI.Utility.BehaviorSets
+{
+    public sealed class UnarmedAttackPlayersBehaviorSet : BehaviorSet
+    {
+        public UnarmedAttackPlayersBehaviorSet(IEntity owner) : base(owner)
+        {
+            Actions = new IAiUtility[]
+            {
+                new UnarmedAttackNearbyPlayerExp(), 
+            };
+        }
+    }
+}