Autosave feature + Pet Ignore fix

Added experimental autosaver feature. Fixed pet ignore feature not
saving/loading data in some cases. Added concurrency protection for
inventory classes and monster book.

src/net/server/channel/handlers/EnterMTSHandler.java

@@ -61,7 +61,6 @@ public final class EnterMTSHandler extends AbstractMaplePacketHandler {
         Server.getInstance().getPlayerBuffStorage().addBuffsToStorage(chr.getId(), chr.getAllBuffs());
         chr.cancelExpirationTask();
         chr.saveToDB();
-        System.out.println("STRANGE SAVE TO DB");
         chr.getMap().removePlayer(c.getPlayer());
         try {
             c.announce(MaplePacketCreator.openCashShop(c, true));