Add CanAttack to IActionBlocker, prevent using guns when dead (#769)

Content.Server/GameObjects/Components/Mobs/DamageStates.cs

@@ -72,6 +72,11 @@ namespace Content.Server.GameObjects
         {
             return true;
         }
+
+        bool IActionBlocker.CanAttack()
+        {
+            return true;
+        }
     }
 
     /// <summary>
@@ -128,6 +133,11 @@ namespace Content.Server.GameObjects
         {
             return false;
         }
+
+        bool IActionBlocker.CanAttack()
+        {
+            return false;
+        }
     }
 
     /// <summary>
@@ -204,5 +214,10 @@ namespace Content.Server.GameObjects
         {
             return false;
         }
+
+        bool IActionBlocker.CanAttack()
+        {
+            return false;
+        }
     }
 }