Implement Lua quest api for expeditions

zone/questmgr.h

@@ -365,6 +365,9 @@ public:
 	bool DisableRecipe(uint32 recipe_id);
 	void ClearNPCTypeCache(int npctype_id);
 	void ReloadZoneStaticData();
+	Expedition* GetExpeditionByCharID(uint32 char_id);
+	Expedition* GetExpeditionByInstanceID(uint32 instance_id);
+	Expedition* GetExpeditionForCurrentInstance();
 
 	Client *GetInitiator() const;
 	NPC *GetNPC() const;