Water of Life + Fixed GPQ & Buff system

Added Water of Life. Fixed Shuang (GPQ) npc dc'ing the leader when first
trying to enter the waiting area. Fixed some cases with the revamped
buff system, that would not properly check for the best buffs in some
scenarios, and would throw exceptions, caused by not properly protecting
access to critical data.

src/net/PacketProcessor.java

@@ -245,6 +245,7 @@ public final class PacketProcessor {
             registerHandler(RecvOpcode.MONSTER_CARNIVAL, new MonsterCarnivalHandler());
             registerHandler(RecvOpcode.REMOTE_STORE, new RemoteStoreHandler());
             registerHandler(RecvOpcode.WEDDING_ACTION, new WeddingHandler());
+            registerHandler(RecvOpcode.WATER_OF_LIFE, new UseWaterOfLifeHandler());
             registerHandler(RecvOpcode.ADMIN_CHAT, new AdminChatHandler());
             registerHandler(RecvOpcode.MOVE_DRAGON, new MoveDragonHandler());
         }