* Enable it by uncomment `#define PACKET_OBFUSCATION` in mmo.h
* Obfuscation keys are defined in db/packet_db.txt, each packet_ver has their own default keys (for temperory lookup) in `packet_keys:` right after `packet_ver:`
* Keys can be refined (user-defined keys) by defining the keys in `packet_keys_use:` in file db/[import/]packet_db.txt
* This feature only for client 20110817 or newer
* `@reloadpacketdb` won't changes the keys, so make sure define everything before run the map-server.
Thank to @icxbb-xx, @aleos, 5a942993dd
Signed-off-by: Cydh Ramdh <house.bad@gmail.com>
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