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

src/server/scripts/Commands/cs_learn.cpp

@@ -27,6 +27,7 @@ EndScriptData */
 #include "ObjectMgr.h"
 #include "SpellMgr.h"
 #include "SpellInfo.h"
+#include "Player.h"
 
 class learn_commandscript : public CommandScript
 {