1) New hookable Engine func: GetInfoKeyBuffer
2) New GameDLL func that can be called via engfunc: GetInfoKeyBuffer
3) New native: copy_infokey_buffer that copies data out of the specified info key buffer
4) EngFunc_InfoKeyValue, EngFunc_SetKeyValue, and EngFunc_SetClientKeyValue have been reworked
so that they expect pointers to an info key buffer in order to work properly o_O
1) New hookable GameDLL funcs: UpdateClientData, AddToFullPack, CmdStart, CmdEnd (at28754)
2) New GameDLL funcs that can be called via dllfunc: UpdateClientData, AddToFullPack, CmdStart, CmdEnd
3) New natives to read/write special data structures associated with the above GameDLL funcs:
get/set_cd (ClientData), get/set_es (EntityState), get/set_uc (UserCmd)
