Added SMSG_SPELL_DELAYED, SMSG_SPELL_FAILED_OTHER,
   SMSG_SPELL_FAILURE
Cleanup 18019 code
Fix opcode group counter
Cleanup 18414 code
Update MovementFlags.
Added CMSG_CANCEL_AURA, CMSG_CANCEL_CAST, CMSG_CANCEL_MOUNT_AURA,
   CMSG_LEARN_TALENT, CMSG_UNLEARN_SKILL, CMSG_UNK_10A7,
   MSG_MOVE_ROOT, SMSG_AUCTION_HELLO, SMSG_CAST_FAILED,
   SMSG_INITIAL_SPELLS, SMSG_REMOVED_SPELL,
   SMSG_SPELL_CATEGORY_COOLDOWN, SMSG_UNK_02A7, SMSG_UNK_1861.
Update CMSG_AREATRIGGER, CMSG_ATTACKSTOP,
  SMSG_SPELL_START, SMSG_SPELL_GO, CMSG_AREATRIGGER,
  CombatLogHandler
Added CMSG_ALTER_APPEARANCE.