[6828] Added script name indexing for creature, gameobject, item, areatrigger and instance scripts.

* loaded all distinct script names into one vector at server startup
* added custom loaders to convert the script names to indices
* converted all the script lookup functions to use the index instead of the name

src/game/World.cpp

@@ -927,6 +927,9 @@ void World::SetInitialWorldSettings()
     LoadDBCStores(m_dataPath);
     DetectDBCLang();
 
+    sLog.outString( "Loading Script Names...");
+    objmgr.LoadScriptNames();
+
     sLog.outString( "Loading InstanceTemplate" );
     objmgr.LoadInstanceTemplate();