add opcode CMSG_CANCEL_AURA
Update Opcodes.cpp
Update Opcodes.h
Server/PacketIO: Added structure and opcode form CMSG_LIST_INVENTORY

* Added structure for SMSG_LIST_INVENTORY

* Added opcode for CMSG_BUY_ITEM and CMSG_SELL_ITEM
Merge pull request #29 from Rawaho/patch-1

Server/PacketIO: Fixed Vendors
Merge pull request #28 from projectcore/patch-18

add CMSG_USE_ITEM
Merge pull request #27 from projectcore/patch-17

Update Opcodes.cpp
Merge pull request #26 from projectcore/patch-15

add opcode CMSG_CANCEL_AURA