[c2776] Support hard-mode loot in Zul'Aman - Also fix compile

* Fix compile with C-MaNGOS 13005, Requires 12418
* Add support for hard-mode checks in Zul'Aman, timed event
 - Each chest can now be checked with 1..4 if it's associated npc was resued first..forth (or 0 for none at all)

(based on commit 7d5cff4)