Stupidly shoddy combat mode system.

Doesn't even work for guns, oh well.

Content.Server/GameObjects/EntitySystems/CombatModeSystem.cs

@@ -0,0 +1,35 @@
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Shared.Input;
+using Robust.Server.GameObjects.EntitySystems;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Input;
+using Robust.Shared.Players;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    public sealed class CombatModeSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            var inputSystem = EntitySystemManager.GetEntitySystem<InputSystem>();
+            inputSystem.BindMap.BindFunction(ContentKeyFunctions.ToggleCombatMode,
+                InputCmdHandler.FromDelegate(CombatModeToggled));
+        }
+
+        private void CombatModeToggled(ICommonSession session)
+        {
+            var playerSession = (IPlayerSession) session;
+
+            if (playerSession.AttachedEntity == null ||
+                !playerSession.AttachedEntity.TryGetComponent(out CombatModeComponent combatModeComponent))
+            {
+                return;
+            }
+
+            combatModeComponent.IsInCombatMode = !combatModeComponent.IsInCombatMode;
+        }
+    }
+}