Core: Remove Player.h dependency from all the possible headers

src/server/scripts/Northrend/wintergrasp.cpp

@@ -25,6 +25,7 @@
 #include "ScriptedCreature.h"
 #include "ScriptedGossip.h"
 #include "SpellScript.h"
+#include "Player.h"
 
 #define GOSSIP_HELLO_DEMO1  "Build catapult."
 #define GOSSIP_HELLO_DEMO2  "Build demolisher."