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

src/server/game/Maps/MapInstanced.cpp

@@ -24,6 +24,7 @@
 #include "InstanceSaveMgr.h"
 #include "World.h"
 #include "Group.h"
+#include "Player.h"
 
 MapInstanced::MapInstanced(uint32 id, time_t expiry) : Map(id, expiry, 0, DUNGEON_DIFFICULTY_NORMAL)
 {
@@ -280,4 +281,4 @@ bool MapInstanced::CanEnter(Player* /*player*/)
 {
     //ASSERT(false);
     return true;
-}
+}