Add option to disable expedition conflict messages

Add optional argument to CreateExpedition to disable conflict messages

Some live expeditions like anguish use a timeout to prevent excessive
leader conflict messages while still performing a creation request

zone/expedition_request.h

@@ -37,7 +37,9 @@ struct ExpeditionMember;
 class ExpeditionRequest
 {
 public:
-	ExpeditionRequest(std::string expedition_name, uint32_t min_players, uint32_t max_players, bool has_replay_timer);
+	ExpeditionRequest(
+		std::string expedition_name, uint32_t min_players, uint32_t max_players,
+		bool has_replay_timer, bool disable_messages = false);
 
 	bool Validate(Client* requester);
 
@@ -69,6 +71,7 @@ private:
 	uint32_t m_min_players          = 0;
 	uint32_t m_max_players          = 0;
 	bool     m_check_event_lockouts = true;
+	bool     m_disable_messages     = false;
 	bool     m_has_replay_timer     = false;
 	std::string m_expedition_name;
 	std::string m_leader_name;