feat(PlayerHooks): OnLearnSpell(player, spellid) (#46)

OnLearnSpell

src/LuaEngine/GlobalMethods.h

@@ -706,6 +706,7 @@ namespace LuaGlobalFunctions
      *     // UNUSED                               =     41,       // (event, player)
      *     PLAYER_EVENT_ON_COMMAND                 =     42,       // (event, player, command, chatHandler) - player is nil if command used from console. Can return false
      *     PLAYER_EVENT_ON_PET_ADDED_TO_WORLD      =     43,       // (event, player, pet)
+     * *   PLAYER_EVENT_ON_LEARN_SPELL             =     44,       // (event, player, spellId)
      * };
      * </pre>
      *