* This let more easy catch packet structure chnages at client switch.
* Fixed structure CMSG_GUILD_BANK_SWAP_ITEMS
* Fixed structure CMSG_SPLIT_ITEM, CMSG_SELL_ITEM
* Added read data amount fixes for some other packets.
Thanks to TOM_RUS in help check correct packets structure.
Note: not all packets possible fixed. Please report for not fixed cases at errors:
"opcode %s (0x%.4X) have unprocessed tail data (read stop at %u from %u)"
CHECK_PACKET_SIZE was pretty error prone; once it was forgotten mangosd
could crash due to the asserts in ByteBuffer.h. That was exploitable by
malicious players.
Furthermore, there were duplicate checks: Additionally to
CHECK_PACKET_SIZE, the ByteBuffer assertions keept an eye
on not exceeding the packet boundaries - just to crash the server for
sure in such a case.
To prevent memory leaks or other undesirable states, please read in
every handler all variables _before_ doing any concrete handling.
Including fix _SCallback for 3 params, triggred mode correct call for .cast back and .cast target.
Remove outdated code for support old 19421 (and ranks) implementation in client data.
