Disable speaking while unconscious/dead (#362)

* Disable speaking while unconscious/dead

Fixes #359

* Add CanSpeak ActionBlocker

Matches the existing technique for other actions like CanUse() and CanThrow().

Content.Server/GameObjects/EntitySystems/ActionBlockerSystem.cs

@@ -12,6 +12,8 @@ namespace Content.Server.GameObjects.EntitySystems
         bool CanUse();
 
         bool CanThrow();
+
+        bool CanSpeak();
     }
 
     public class ActionBlockerSystem : EntitySystem
@@ -55,5 +57,15 @@ namespace Content.Server.GameObjects.EntitySystems
             }
             return canthrow;
         }
+
+        public static bool CanSpeak(IEntity entity)
+        {
+            bool canspeak = true;
+            foreach (var actionblockercomponents in entity.GetAllComponents<IActionBlocker>())
+            {
+                canspeak &= actionblockercomponents.CanSpeak();
+            }
+            return canspeak;
+        }
     }
 }