added chat trigger detection

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401475

plugins/include/console.inc

@@ -230,6 +230,15 @@ native ReplySource:GetCmdReplySource();
  */
 native ReplySource:SetCmdReplySource(ReplySource:source);
 
+/**
+ * Returns whether the current say hook is a chat trigger.
+ *
+ * This function is only meaningful inside say or say_team hooks.
+ *
+ * @return				True if a chat trigger, false otherwise.
+ */
+native bool:IsChatTrigger();
+
 /**
  * Displays usage of an admin command to users depending on the 
  * setting of the sm_show_activity cvar.  Additionally, the client