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

src/server/scripts/Commands/cs_instance.cpp

@@ -28,6 +28,7 @@ EndScriptData */
 #include "InstanceSaveMgr.h"
 #include "InstanceScript.h"
 #include "MapManager.h"
+#include "Player.h"
 
 class instance_commandscript : public CommandScript
 {