Major schedules & DB refactor

Refactored many calls for TimerManager's schedules throughout the source.
Switched all tables using MyISAM to InnoDB: on a multi-threaded environment such as this, table-locking is an instant no-no, and other gains MyISAM would have over InnoDB are minimal.
Altered getConnection() to properly throw an exception (good practice!) in case of no available connection instead of a mere null.

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

@@ -65,6 +65,7 @@ public class EnterCashShopHandler extends AbstractMaplePacketHandler {
             mc.cancelDiseaseExpireTask();
             mc.cancelSkillCooldownTask();
             mc.cancelExpirationTask();
+            mc.cancelQuestExpirationTask();
 
             c.announce(MaplePacketCreator.openCashShop(c, false));
             c.announce(MaplePacketCreator.showCashInventory(c));